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Low-energy spin excitations in (Li_{0.8} Fe_{0.2} )ODFeSe superconductor studied with inelastic neutron scattering (2017)

Mingwei Ma, Lichen Wang, Philippe Bourges, Yvan Sidis, Sergey Danilkin, and Yuan Li

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-03-18

Beschreibung: Author(s): Mingwei Ma, Lichen Wang, Philippe Bourges, Yvan Sidis, Sergey Danilkin, and Yuan Li We report an inelastic neutron scattering study of single crystals of ( Li 0.8 Fe 0.2 )ODFeSe. Temperature-dependent low-energy spin excitations are observed near Q = ( 0.5 , 0.27 , 0.5 ) and equivalent wave vectors symmetrically surrounding Q = ( 0.5 , 0.5 , 0.5 ) in the 1-Fe Brillouin zone, consistent with a Fermi-sur… [Phys. Rev. B 95, 100504(R)] Published Fri Mar 17, 2017

Schlagwort(e): Superfluidity and superconductivity

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

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Superconductor-antiferromagnet-superconductor π Josephson junction based on an antiferromagnetic barrier (2017)

Lev Bulaevskii, Ronivon Eneias, and Alvaro Ferraz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-03-21

Beschreibung: Author(s): Lev Bulaevskii, Ronivon Eneias, and Alvaro Ferraz We show theoretically that π Josephson junctions may be constructed by use of antiferromagnetic (AF) metals between superconducting electrodes. We argue that the AF magnetic ordering introduces the energy difference of electrons in a Cooper pair due to the effect of the exchange field varying in spa… [Phys. Rev. B 95, 104513] Published Mon Mar 20, 2017

Schlagwort(e): Superfluidity and superconductivity

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Coherent transport properties of a three-terminal hybrid superconducting interferometer (2017)

F. Vischi, M. Carrega, E. Strambini, S. D'Ambrosio, F. S. Bergeret, Yu. V. Nazarov, and F. Giazotto

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-02-14

Beschreibung: Author(s): F. Vischi, M. Carrega, E. Strambini, S. D'Ambrosio, F. S. Bergeret, Yu. V. Nazarov, and F. Giazotto We present an exhaustive theoretical analysis of a double-loop Josephson proximity interferometer, such as the one recently realized by Strambini et al. for control of the Andreev spectrum via an external magnetic field. This system, called ω -SQUIPT, consists of a T-shaped diffusive normal metal ( N )… [Phys. Rev. B 95, 054504] Published Mon Feb 13, 2017

Schlagwort(e): Superfluidity and superconductivity

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Superfluidity in Bose-Hubbard circuits (2017)

Geva Arwas and Doron Cohen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-02-14

Beschreibung: Author(s): Geva Arwas and Doron Cohen A semiclassical theory is provided for the metastability regime diagram of atomtronic superfluid circuits. Such circuits typically exhibit high-dimensional chaos, and nonlinear resonances that couple the Bogoliubov excitations manifest. Contrary to the expectation, these resonances do not originate … [Phys. Rev. B 95, 054505] Published Mon Feb 13, 2017

Schlagwort(e): Superfluidity and superconductivity

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Quenching a quantum critical state by the order parameter: Dynamical quantum phase transitions and quantum speed limits (2017)

Markus Heyl

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-02-14

Beschreibung: Author(s): Markus Heyl The dynamics in the vicinity of quantum phase transitions entails a variety of important and universal phenomena, such as critical slowing down or the Kibble-Zurek mechanism, which are associated with the low-energy and long-time properties at criticality. Here, the author reveals that the opposite regime of transient nonequilibrium time evolution at criticality can similarly host universal temporal behavior. By strongly perturbing a quantum critical state through quenching the associated order parameter, the system experiences a dynamical quantum phase transition with physical quantities becoming nonanalytic at critical times. These dynamical quantum phase transitions are caused by superextensive energy fluctuations induced by the particular protocol, which turn out to have profound consequences for quantum speed limits and potential restricted thermalization despite the nonintegrability of the system. [Phys. Rev. B 95, 060504(R)] Published Thu Feb 09, 2017

Schlagwort(e): Superfluidity and superconductivity

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Noncentrosymmetric superconductors in one dimension (2017)

K. V. Samokhin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-02-14

Beschreibung: Author(s): K. V. Samokhin We study the fermionic boundary modes (Andreev bound states) in a time-reversal invariant one-dimensional superconductor. In the presence of a substrate, spatial inversion symmetry is broken and the electronic properties are strongly affected by an antisymmetric spin-orbit coupling. We assume an arb… [Phys. Rev. B 95, 064504] Published Wed Feb 08, 2017

Schlagwort(e): Superfluidity and superconductivity

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Precise determination of magnetic moment of a fluxoid quantum in a superconducting microring (2017)

Heonhwa Choi, Yun Won Kim, Soon-Gul Lee, Mahn-Soo Choi, Min-Seok Kim, and Jae-Hyuk Choi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-02-14

Beschreibung: Author(s): Heonhwa Choi, Yun Won Kim, Soon-Gul Lee, Mahn-Soo Choi, Min-Seok Kim, and Jae-Hyuk Choi Using dynamic cantilever magnetometry and experimentally determining the cantilever's vibrational mode shape, we precisely measured the magnetic moment of a lithographically defined micron-sized superconducting Nb ring, a key element for the previously proposed subpiconewton force standard. The magn… [Phys. Rev. B 95, 064505] Published Wed Feb 08, 2017

Schlagwort(e): Superfluidity and superconductivity

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Uniaxial strain effects on the superconducting transition in Re-doped Hg-1223 cuprate superconductors (2017)

Masaki Mito, Kazuma Ogata, Hiroki Goto, Kazuki Tsuruta, Kazuma Nakamura, Hiroyuki Deguchi, Tomoya Horide, Kaname Matsumoto, Takayuki Tajiri, Hiroshi Hara, Toshinori Ozaki, Hiroyuki Takeya, and Yoshihiko Takano

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-02-14

Beschreibung: Author(s): Masaki Mito, Kazuma Ogata, Hiroki Goto, Kazuki Tsuruta, Kazuma Nakamura, Hiroyuki Deguchi, Tomoya Horide, Kaname Matsumoto, Takayuki Tajiri, Hiroshi Hara, Toshinori Ozaki, Hiroyuki Takeya, and Yoshihiko Takano The effects of uniaxial strain and hydrostatic pressure on Hg 0.83 Re 0.18 Ba 2 Ca 2.4 Cu 3.6 O 14 [ Hg 0.83 ( Re 0.18 ) − 1223 ] were investigated by ac magnetic measurements under stress corresponding to a pressure of 20 GPa at maximum. According to a previous thermal study based on the Ehrenfest relation, in-plane co… [Phys. Rev. B 95, 064503] Published Tue Feb 07, 2017

Schlagwort(e): Superfluidity and superconductivity

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Metal-catalyzed electrochemical diazidation of alkenes (2017)

Fu, N., Sauer, G. S., Saha, A., Loo, A., Lin, S.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-08-11

Beschreibung: Vicinal diamines are a common structural motif in bioactive natural products, therapeutic agents, and molecular catalysts, motivating the continuing development of efficient, selective, and sustainable technologies for their preparation. We report an operationally simple and environmentally friendly protocol that converts alkenes and sodium azide—both readily available feedstocks—to 1,2-diazides. Powered by electricity and catalyzed by Earth-abundant manganese, this transformation proceeds under mild conditions and exhibits exceptional substrate generality and functional group compatibility. Using standard protocols, the resultant 1,2-diazides can be smoothly reduced to vicinal diamines in a single step, with high chemoselectivity. Mechanistic studies are consistent with metal-mediated azidyl radical transfer as the predominant pathway, enabling dual carbon-nitrogen bond formation.

Schlagwort(e): Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Low-energy inelastic response in the superconducting phases of ${\mathrm{PrOs}}_{4}{\mathrm{Sb}}_{12}$ (2017)

Chandan Setty, Yuxuan Wang, and Philip W. Phillips

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): Chandan Setty, Yuxuan Wang, and Philip W. Phillips Recent ac susceptibility and polar Kerr effect measurements in the skutterudite superconductor PrOs 4 Sb 12 (POS) (E. M. Levenson-Falk, E. R. Schemm, M. B. Maple, and A. Kapitulnik, arXiv:1609.07535 ) uncovered the nature of the superconducting double transition from a high-temperature, high-field, time... [Phys. Rev. B 96, 054508] Published Fri Aug 11, 2017

Schlagwort(e): Superfluidity and superconductivity

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Extreme anisotropy and anomalous transport properties of heavily electron doped ${\mathrm{Li}}_{x}{({\mathrm{NH}}_{3})}_{y}{\mathrm{Fe}}_{2}{\mathrm{Se}}_{2}$ single crystals (2017)

Shanshan Sun (孙珊珊), Shaohua Wang (王少华), Rong Yu (俞榕), and Hechang Lei (雷和畅)

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): Shanshan Sun (孙珊珊), Shaohua Wang (王少华), Rong Yu (俞榕), and Hechang Lei (雷和畅) We report the growth of heavily electron doped Li- NH 3 intercalated FeSe single crystals that are free of material complexities and allow access to the intrinsic superconducting properties. Li x ( NH 3 ) y Fe 2 Se 2 single crystals show extremely large electronic anisotropy in both normal and superconducting s... [Phys. Rev. B 96, 064512] Published Fri Aug 11, 2017

Schlagwort(e): Superfluidity and superconductivity

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Wave-packet dynamics of Bogoliubov quasiparticles: Quantum metric effects (2017)

Long Liang, Sebastiano Peotta, Ari Harju, and Päivi Törmä

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): Long Liang, Sebastiano Peotta, Ari Harju, and Päivi Törmä We study the dynamics of the Bogoliubov wave packet in superconductors and calculate the supercurrent carried by the wave packet. We discover an anomalous contribution to the supercurrent, related to the quantum metric of the Bloch wave function. This anomalous contribution is most important for fla... [Phys. Rev. B 96, 064511] Published Fri Aug 11, 2017

Schlagwort(e): Superfluidity and superconductivity

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Superconductor-insulator transition in disordered Josephson-junction chains (2017)

M. Bard, I. V. Protopopov, I. V. Gornyi, A. Shnirman, and A. D. Mirlin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): M. Bard, I. V. Protopopov, I. V. Gornyi, A. Shnirman, and A. D. Mirlin We study the superconductor-insulator quantum phase transition in disordered Josephson-junction chains. To this end, we derive the field theory from the lattice model that describes a chain of superconducting islands with a capacitive coupling to the ground ( C 0 ) as well as between the islands ( C 1 ). ... [Phys. Rev. B 96, 064514] Published Fri Aug 11, 2017

Schlagwort(e): Superfluidity and superconductivity

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Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide ${\mathrm{FeSe}}_{0.45}{\mathrm{Te}}_{0.55}$ (2017)

Saheli Sarkar, John Van Dyke, Peter O. Sprau, Freek Massee, Ulrich Welp, Wai-Kwong Kwok, J. C. Seamus Davis, and Dirk K. Morr

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): Saheli Sarkar, John Van Dyke, Peter O. Sprau, Freek Massee, Ulrich Welp, Wai-Kwong Kwok, J. C. Seamus Davis, and Dirk K. Morr We demonstrate that the differential conductance, d I / d V , measured via spectroscopic imaging scanning tunneling microscopy in the doped iron chalcogenide FeSe 0.45 Te 0.55 , possesses a series of characteristic features that allow one to extract the orbital structure of the superconducting gaps. This yie... [Phys. Rev. B 96, 060504(R)] Published Wed Aug 09, 2017

Schlagwort(e): Superfluidity and superconductivity

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Proximity Eliashberg theory of electrostatic field-effect doping in superconducting films (2017)

G. A. Ummarino, E. Piatti, D. Daghero, R. S. Gonnelli, Irina Yu. Sklyadneva, E. V. Chulkov, and R. Heid

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): G. A. Ummarino, E. Piatti, D. Daghero, R. S. Gonnelli, Irina Yu. Sklyadneva, E. V. Chulkov, and R. Heid We calculate the effect of a static electric field on the critical temperature of a s -wave one band superconductor in the framework of proximity effect Eliashberg theory. In the weak electrostatic field limit the theory has no free parameters while, in general, the only free parameter is the thickne... [Phys. Rev. B 96, 064509] Published Wed Aug 09, 2017

Schlagwort(e): Superfluidity and superconductivity

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Interface currents and magnetization in singlet-triplet superconducting heterostructures: Role of chiral and helical domains (2017)

Alfonso Romano, Canio Noce, Ilya Vekhter, and Mario Cuoco

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-15

Beschreibung: Author(s): Alfonso Romano, Canio Noce, Ilya Vekhter, and Mario Cuoco Chiral and helical domain walls are generic defects of topological spin-triplet superconductors. We study theoretically the magnetic and transport properties of superconducting singlet-triplet-singlet heterostructure as a function of the phase difference between the singlet leads in the presence of ... [Phys. Rev. B 96, 054512] Published Mon Aug 14, 2017

Schlagwort(e): Superfluidity and superconductivity

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17

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Universal properties of high-temperature superconductors from real-space pairing: Role of correlated hopping and intersite Coulomb interaction within the $t\text{−}J\text{−}U$ model (2017)

Michał Zegrodnik and Józef Spałek

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-15

Beschreibung: Author(s): Michał Zegrodnik and Józef Spałek We study the effect of the correlated hopping term and the intersite Coulomb interaction term on principal features of the d -wave superconducting (SC) state, in both the electron- and hole-doped regimes within the t − J − U model. In our analysis, we use the approach based on the diagrammatic expansion ... [Phys. Rev. B 96, 054511] Published Mon Aug 14, 2017

Schlagwort(e): Superfluidity and superconductivity

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Playing marble run to make methane (2017)

Dobbek, H.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-08-18

Schlagwort(e): Chemistry

Print ISSN: 0036-8075

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Methanogenic archaea metabolism (2017)

Vinson, V.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-08-18

Schlagwort(e): Chemistry

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Methanogenic heterodisulfide reductase (HdrABC-MvhAGD) uses two noncubane [4Fe-4S] clusters for reduction (2017)

Wagner, T., Koch, J., Ermler, U., Shima, S.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-08-18

Beschreibung: In methanogenic archaea, the carbon dioxide (CO 2 ) fixation and methane-forming steps are linked through the heterodisulfide reductase (HdrABC)–[NiFe]-hydrogenase (MvhAGD) complex that uses flavin-based electron bifurcation to reduce ferredoxin and the heterodisulfide of coenzymes M and B. Here, we present the structure of the native heterododecameric HdrABC-MvhAGD complex at 2.15-angstrom resolution. HdrB contains two noncubane [4Fe-4S] clusters composed of fused [3Fe-4S]-[2Fe-2S] units sharing 1 iron (Fe) and 1 sulfur (S), which were coordinated at the CCG motifs. Soaking experiments showed that the heterodisulfide is clamped between the two noncubane [4Fe-4S] clusters and homolytically cleaved, forming coenzyme M and B bound to each iron. Coenzymes are consecutively released upon one-by-one electron transfer. The HdrABC-MvhAGD atomic model serves as a structural template for numerous HdrABC homologs involved in diverse microbial metabolic pathways.

Schlagwort(e): Chemistry

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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A water window on surface chemistry (2017)

Hunger, J., Parekh, S. H.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-08-25

Schlagwort(e): Chemistry

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Terahertz field control of interlayer transport modes in cuprate superconductors (2017)

Frank Schlawin, Anastasia S. D. Dietrich, Martin Kiffner, Andrea Cavalleri, and Dieter Jaksch

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-29

Beschreibung: Author(s): Frank Schlawin, Anastasia S. D. Dietrich, Martin Kiffner, Andrea Cavalleri, and Dieter Jaksch We theoretically show that terahertz pulses with controlled amplitude and frequency can be used to switch between stable transport modes in layered superconductors, modeled as stacks of Josephson junctions. We find pulse shapes that deterministically switch the transport mode between superconducting... [Phys. Rev. B 96, 064526] Published Mon Aug 28, 2017

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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Optimal inhomogeneity for pairing in Hubbard systems with next-nearest-neighbor hopping (2017)

Gideon Wachtel, Shirit Baruch, and Dror Orgad

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-31

Beschreibung: Author(s): Gideon Wachtel, Shirit Baruch, and Dror Orgad Previous studies have shown that bipartite Hubbard systems with inhomogeneous hopping amplitudes can exhibit higher pair-binding energies than the uniform model. Here we examine whether this result holds for systems with a more generic band structure. To this end, we use exact diagonalization and th... [Phys. Rev. B 96, 064527] Published Wed Aug 30, 2017

Schlagwort(e): Superfluidity and superconductivity

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X-ray vision spies copper on the move (2017)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-09-01

Schlagwort(e): Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Spin-singlet superconductivity in the doped topological crystalline insulator ${\mathrm{Sn}}_{0.96}{\mathrm{In}}_{0.04}\mathrm{Te}$ (2017)

Satoki Maeda, Ryohei Hirose, Kazuaki Matano, Mario Novak, Yoichi Ando, and Guo-qing Zheng

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-06

Beschreibung: Author(s): Satoki Maeda, Ryohei Hirose, Kazuaki Matano, Mario Novak, Yoichi Ando, and Guo-qing Zheng The In-doped topological crystalline insulator Sn 1 − x In x Te is a candidate for a topological superconductor, where a pseudo-spin-triplet state has been proposed. To clarify the spin symmetry of Sn 1 − x In x Te , we perform Te 125 -nuclear magnetic resonance (NMR) measurements in polycrystalline samples with 0 ... [Phys. Rev. B 96, 104502] Published Tue Sep 05, 2017

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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Quantum dynamics of a Josephson junction driven cavity mode system in the presence of voltage bias noise (2017)

Hui Wang (王惠), M. P. Blencowe, A. D. Armour, and A. J. Rimberg

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-06

Beschreibung: Author(s): Hui Wang (王惠), M. P. Blencowe, A. D. Armour, and A. J. Rimberg We give a semiclassical analysis of the average photon number as well as photon number variance (Fano factor F ) for a Josephson junction (JJ) embedded microwave cavity system, where the JJ is subject to a fluctuating (i.e., noisy) bias voltage with finite dc average. Through the ac Josephson effect,... [Phys. Rev. B 96, 104503] Published Tue Sep 05, 2017

Schlagwort(e): Superfluidity and superconductivity

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TRILEX and $GW$+EDMFT approach to $d$-wave superconductivity in the Hubbard model (2017)

J. Vučičević, T. Ayral, and O. Parcollet

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-06

Beschreibung: Author(s): J. Vučičević, T. Ayral, and O. Parcollet In high-temperature superconductors, the superconductivity appears on the verge of Mott localization and is mediated by collective electronic excitations. Here, the authors present a general theoretical framework (TRILEX) that combines the ideas of DMFT and spin-fluctuation theory, and is shown to capture both the d -wave superconductivity and the Mott insulating phase in the Hubbard model. The emphasis is laid on the local scattering between the electrons and the effective long-range bosonic degrees of freedom. The renormalized electron-boson vertex is obtained from a quantum Monte Carlo solution of a self-consistent single-impurity effective model. Therefore, the calculation is of significantly lighter weight compared to the minimal cluster DMFT required for the same purpose. Additionally, both the level and flavor of the approximation are variable, in a fully controlled manner. [Phys. Rev. B 96, 104504] Published Tue Sep 05, 2017

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Hydrostatic pressure effect on the transport properties in TiO superconducting thin films (2017)

X. Liu, C. Zhang, F. X. Hao, T. Y. Wang, Y. J. Fan, Y. W. Yin, and X. G. Li

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-06

Beschreibung: Author(s): X. Liu, C. Zhang, F. X. Hao, T. Y. Wang, Y. J. Fan, Y. W. Yin, and X. G. Li The superconducting properties of the TiO epitaxial thin films were systematically investigated under hydrostatic pressures ( P ) up to 2.13 GPa. At ambient pressure, the normal state resistivity increases with decreasing temperature, and steeply increases below T kink ∼ 115 K . With further reducing tempe... [Phys. Rev. B 96, 104505] Published Tue Sep 05, 2017

Schlagwort(e): Superfluidity and superconductivity

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Gauge theory of the long-range proximity effect and spontaneous currents in superconducting heterostructures with strong ferromagnets (2017)

I. V. Bobkova, A. M. Bobkov, and M. A. Silaev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-09

Beschreibung: Author(s): I. V. Bobkova, A. M. Bobkov, and M. A. Silaev We present the generalized quasiclassical theory of the long-range superconducting proximity effect in heterostructures with strong ferromagnets, where the exchange splitting is of the order of Fermi energy. In the ferromagnet the propagation of equal-spin Cooper pairs residing on the spin-split Fer... [Phys. Rev. B 96, 094506] Published Fri Sep 08, 2017

Schlagwort(e): Superfluidity and superconductivity

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Josephson radiation and shot noise of a semiconductor nanowire junction (2017)

David J. van Woerkom, Alex Proutski, Ruben J. J. van Gulik, Tamás Kriváchy, Diana Car, Sébastian R. Plissard, Erik P. A. M. Bakkers, Leo P. Kouwenhoven, and Attila Geresdi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-12

Beschreibung: Author(s): David J. van Woerkom, Alex Proutski, Ruben J. J. van Gulik, Tamás Kriváchy, Diana Car, Sébastian R. Plissard, Erik P. A. M. Bakkers, Leo P. Kouwenhoven, and Attila Geresdi We measured the Josephson radiation emitted by an InSb semiconductor nanowire junction utilizing photon-assisted quasiparticle tunneling in an ac-coupled superconducting tunnel junction. We quantify the action of the local microwave environment by evaluating the frequency dependence of the inelastic... [Phys. Rev. B 96, 094508] Published Mon Sep 11, 2017

Schlagwort(e): Superfluidity and superconductivity

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Electron-phonon coupling mechanisms for hydrogen-rich metals at high pressure (2017)

K. Tanaka, J. S. Tse, and H. Liu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-12

Beschreibung: Author(s): K. Tanaka, J. S. Tse, and H. Liu The mechanisms for strong electron-phonon coupling predicted for hydrogen-rich alloys with high superconducting critical temperature ( T c ) are examined within the Migdal-Eliashberg theory. Analysis of the functional derivative of T c with respect to the electron-phonon spectral function shows that at ... [Phys. Rev. B 96, 100502(R)] Published Mon Sep 11, 2017

Schlagwort(e): Superfluidity and superconductivity

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Evolution of multigap superconductivity in the atomically thin limit: Strain-enhanced three-gap superconductivity in monolayer ${\mathrm{MgB}}_{2}$ (2017)

J. Bekaert, A. Aperis, B. Partoens, P. M. Oppeneer, and M. V. Milošević

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-12

Beschreibung: Author(s): J. Bekaert, A. Aperis, B. Partoens, P. M. Oppeneer, and M. V. Milošević Starting from first principles, we show the formation and evolution of superconducting gaps in MgB 2 at its ultrathin limit. Atomically thin MgB 2 is distinctly different from bulk MgB 2 in that surface states become comparable in electronic density to the bulklike σ and π bands. Combining the ab initi... [Phys. Rev. B 96, 094510] Published Mon Sep 11, 2017

Schlagwort(e): Superfluidity and superconductivity

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Anomalous temperature evolution of the electronic structure of FeSe (2017)

Y. S. Kushnirenko, A. A. Kordyuk, A. V. Fedorov, E. Haubold, T. Wolf, B. Büchner, and S. V. Borisenko

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-16

Beschreibung: Author(s): Y. S. Kushnirenko, A. A. Kordyuk, A. V. Fedorov, E. Haubold, T. Wolf, B. Büchner, and S. V. Borisenko We present angle-resolved photoemission spectroscopy data taken from the structurally simplest representative of iron-based superconductors, FeSe, in a wide temperature range. Apart from the variations related to the nematic transition, we detect very pronounced shifts of the dispersions on the scal... [Phys. Rev. B 96, 100504(R)] Published Fri Sep 15, 2017

Schlagwort(e): Superfluidity and superconductivity

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Magnetic field induced emergent inhomogeneity in a superconducting film with weak and homogeneous disorder (2017)

Rini Ganguly, Indranil Roy, Anurag Banerjee, Harkirat Singh, Amit Ghosal, and Pratap Raychaudhuri

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): Rini Ganguly, Indranil Roy, Anurag Banerjee, Harkirat Singh, Amit Ghosal, and Pratap Raychaudhuri When a magnetic field is applied on a conventional type-II superconductor, the superconducting state gets destroyed at the upper critical field, H c 2 , where the normal vortex cores overlap with each other. Here, we show that in the presence of weak and homogeneous disorder the destruction of supercon... [Phys. Rev. B 96, 054509] Published Fri Aug 11, 2017

Schlagwort(e): Superfluidity and superconductivity

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Superfluidity in density imbalanced bilayers of dipolar fermions (2017)

Azadeh Mazloom and Saeed H. Abedinpour

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): Azadeh Mazloom and Saeed H. Abedinpour We study the zero temperature phase diagram of an imbalanced bilayer of dipolar fermions. We consider perpendicularly aligned identical dipoles in two layers and investigate the effect of population imbalance on the ground state phase at different layer spacings and average densities. The attractive... [Phys. Rev. B 96, 064513] Published Fri Aug 11, 2017

Schlagwort(e): Superfluidity and superconductivity

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Photoinduced filling of near-nodal gap in ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+δ}$ (2017)

Z. Zhang, C. Piovera, E. Papalazarou, M. Marsi, M. d'Astuto, C. J. van der Beek, A. Taleb-Ibrahimi, and L. Perfetti

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): Z. Zhang, C. Piovera, E. Papalazarou, M. Marsi, M. d'Astuto, C. J. van der Beek, A. Taleb-Ibrahimi, and L. Perfetti We report time- and angle-resolved spectroscopic measurements in optimally doped Bi 2 Sr 2 CaCu 2 O 8 + δ . The photoelectron intensity maps are monitored as a function of temperature, photoexcitation density, and delay time from the pump pulse. We evince that thermal fluctuations are effective only for tempe... [Phys. Rev. B 96, 064510] Published Thu Aug 10, 2017

Schlagwort(e): Superfluidity and superconductivity

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Fano fluctuations in superconducting-nanowire single-photon detectors (2017)

A. G. Kozorezov, C. Lambert, F. Marsili, M. J. Stevens, V. B. Verma, J. P. Allmaras, M. D. Shaw, R. P. Mirin, and Sae Woo Nam

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): A. G. Kozorezov, C. Lambert, F. Marsili, M. J. Stevens, V. B. Verma, J. P. Allmaras, M. D. Shaw, R. P. Mirin, and Sae Woo Nam Because of their universal nature, Fano fluctuations are expected to influence the response of superconducting-nanowire single-photon detectors (SNSPDs). We predict that photon counting rate ( P C R ) as a function of bias current ( I B ) in SNSPDs is described by an integral over a transverse coordinate-d... [Phys. Rev. B 96, 054507] Published Wed Aug 09, 2017

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Visualization of quantum turbulence in superfluid $^{3}\mathrm{He}\text{−}B$: Combined numerical and experimental study of Andreev reflection (2017)

V. Tsepelin, A. W. Baggaley, Y. A. Sergeev, C. F. Barenghi, S. N. Fisher, G. R. Pickett, M. J. Jackson, and N. Suramlishvili

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-15

Beschreibung: Author(s): V. Tsepelin, A. W. Baggaley, Y. A. Sergeev, C. F. Barenghi, S. N. Fisher, G. R. Pickett, M. J. Jackson, and N. Suramlishvili We present a combined numerical and experimental study of Andreev scattering from quantum turbulence in superfluid He 3 − B at ultralow temperatures. We simulate the evolution of moderately dense, three-dimensional, quasiclassical vortex tangles and the Andreev reflection of thermal quasiparticle excit... [Phys. Rev. B 96, 054510] Published Mon Aug 14, 2017

Schlagwort(e): Superfluidity and superconductivity

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Majorana zero modes in a two-dimensional $p$-wave superconductor (2017)

Võ Tiến Phong, Niels R. Walet, and Francisco Guinea

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-16

Beschreibung: Author(s): Võ Tiến Phong, Niels R. Walet, and Francisco Guinea We analyze the formation of Majorana zero modes at the edge of a two-dimensional topological superconductor. In particular, we study a time-reversal-invariant triplet phase that is likely to exist in doped Bi 2 Se 3 . Upon the introduction of an in-plane magnetic field to the superconductor, a gap is op... [Phys. Rev. B 96, 060505(R)] Published Tue Aug 15, 2017

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Nonequilibrium superconductivity in driven alkali-doped fullerides (2017)

Giacomo Mazza and Antoine Georges

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-16

Beschreibung: Author(s): Giacomo Mazza and Antoine Georges We investigate the formation of nonequilibrium superconducting states in driven alkali-doped fullerides A 3 C 60 . Within a minimal three-orbital model for the superconductivity of these materials, it was recently demonstrated theoretically that an orbital-dependent imbalance of the interactions leads t... [Phys. Rev. B 96, 064515] Published Tue Aug 15, 2017

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Fulde-Ferrell states in inverse proximity-coupled magnetically doped topological heterostructures (2017)

Moon Jip Park, Junyoung Yang, Youngseok Kim, and Matthew J. Gilbert

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-23

Beschreibung: Author(s): Moon Jip Park, Junyoung Yang, Youngseok Kim, and Matthew J. Gilbert We study the superconducting properties of the thin film BCS superconductor proximity coupled to a magnetically doped time-reversal invariant topological insulator (TI). Using mean-field theory, we show that Fulde-Ferrell (FF) pairing can be induced in the conventional superconductor through the inv... [Phys. Rev. B 96, 064518] Published Thu Aug 17, 2017

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Highly anisotropic superconducting gaps and possible evidence of antiferromagnetic order in FeSe single crystals (2017)

Guan-Yu Chen, Xiyu Zhu, Huan Yang, and Hai-Hu Wen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-25

Beschreibung: Author(s): Guan-Yu Chen, Xiyu Zhu, Huan Yang, and Hai-Hu Wen Specific heat has been measured in FeSe single crystals down to 0.414 K under magnetic fields up to 16 T. A sharp specific-heat anomaly is observed at the superconducting transition temperature T c = 8.2 K. Another jump of specific-heat coefficient C / T is observed at about 1.08 K which is argued to be ... [Phys. Rev. B 96, 064524] Published Thu Aug 24, 2017

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Ruthenium-catalyzed insertion of adjacent diol carbon atoms into C-C bonds: Entry to type II polyketides (2017)

Bender, M., Turnbull, B. W. H., Ambler, B. R., Krische, M. J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-08-25

Beschreibung: Current catalytic processes involving carbon-carbon bond activation rely on -unsaturated coupling partners. Exploiting the concept of transfer hydrogenative coupling, we report a ruthenium(0)-catalyzed cycloaddition of benzocyclobutenones that functionalizes two adjacent saturated diol carbon-hydrogen bonds. These regio- and diastereoselective processes enable convergent construction of type II polyketide substructures.

Schlagwort(e): Chemistry

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Anomalous magnetic moments as evidence of chiral superconductivity in a Bi/Ni bilayer (2017)

Junhua Wang, Xinxin Gong, Guang Yang, Zhaozheng Lyu, Yuan Pang, Guangtong Liu, Zhongqing Ji, Jie Fan, Xiunian Jing, Changli Yang, Fanming Qu, Xiaofeng Jin, and Li Lu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-29

Beschreibung: Author(s): Junhua Wang, Xinxin Gong, Guang Yang, Zhaozheng Lyu, Yuan Pang, Guangtong Liu, Zhongqing Ji, Jie Fan, Xiunian Jing, Changli Yang, Fanming Qu, Xiaofeng Jin, and Li Lu There have been continuous efforts in searching for unconventional superconductivity in the past five decades. Compared to the well-established d -wave superconductivity in cuprates, the existence of superconductivity with pairing symmetries of other high angular momentum is less conclusive. Bi/Ni ep... [Phys. Rev. B 96, 054519] Published Mon Aug 28, 2017

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Phenomenology of the soft gap, zero-bias peak, and zero-mode splitting in ideal Majorana nanowires (2017)

Chun-Xiao Liu, F. Setiawan, Jay D. Sau, and S. Das Sarma

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-31

Beschreibung: Author(s): Chun-Xiao Liu, F. Setiawan, Jay D. Sau, and S. Das Sarma We theoretically consider the observed soft gap in the proximity-induced superconducting state of semiconductor nanowires in the presence of spin-orbit coupling, Zeeman spin splitting, and tunneling leads, but in the absence of any extrinsic disorder (i.e., an ideal system). We critically consider t... [Phys. Rev. B 96, 054520] Published Wed Aug 30, 2017

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Superconductivity in the ferromagnet URhGe under uniaxial pressure (2017)

V. P. Mineev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-02

Beschreibung: Author(s): V. P. Mineev Uniaxial pressure applied in the crystallographic direction perpendicular to spontaneous magnetization in the heavy fermion ferromagnet URhGe strongly stimulates superconductivity in this compound. The phenomenological approach allows us to point out two mechanisms of the increase in the supercondu... [Phys. Rev. B 96, 104501] Published Fri Sep 01, 2017

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Odd-triplet superconductivity in single-level quantum dots (2017)

Stephan Weiss and Jürgen König

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-02

Beschreibung: Author(s): Stephan Weiss and Jürgen König We study the interplay of spin and charge coherence in a single-level quantum dot. A tunnel coupling to a superconducting lead induces superconducting correlations in the dot. With full spin symmetry retained, only even-singlet superconducting correlations are generated. An applied magnetic field or... [Phys. Rev. B 96, 064529] Published Thu Aug 31, 2017

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Impurity-induced bound states inside the superconducting gap of FeSe (2017)

Lin Jiao, Sahana Rößler, Cevriye Koz, Ulrich Schwarz, Deepa Kasinathan, Ulrich K. Rößler, and Steffen Wirth

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-08

Beschreibung: Author(s): Lin Jiao, Sahana Rößler, Cevriye Koz, Ulrich Schwarz, Deepa Kasinathan, Ulrich K. Rößler, and Steffen Wirth We investigate the local density of states in the vicinity of a native dumbbell defect arising from an Fe vacancy in FeSe single crystals. The tunneling spectra close to the impurity display two bound states inside the superconducting gap, equally spaced with respect to zero energy but asymmetric in... [Phys. Rev. B 96, 094504] Published Thu Sep 07, 2017

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Suppression of the antiferromagnetic order when approaching the superconducting state in a phase-separated crystal of ${\mathrm{K}}_{x}{\mathrm{Fe}}_{2−y}{\mathrm{Se}}_{2}$ (2017)

Shichao Li, Yuan Gan, Jinghui Wang, Ruidan Zhong, J. A. Schneeloch, Zhijun Xu, Wei Tian, M. B. Stone, Songxue Chi, M. Matsuda, Y. Sidis, Ph. Bourges, Qiang Li, Genda Gu, J. M. Tranquada, Guangyong Xu, R. J. Birgeneau, and Jinsheng Wen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-07

Beschreibung: Author(s): Shichao Li, Yuan Gan, Jinghui Wang, Ruidan Zhong, J. A. Schneeloch, Zhijun Xu, Wei Tian, M. B. Stone, Songxue Chi, M. Matsuda, Y. Sidis, Ph. Bourges, Qiang Li, Genda Gu, J. M. Tranquada, Guangyong Xu, R. J. Birgeneau, and Jinsheng Wen We have combined elastic and inelastic neutron scattering techniques, magnetic susceptibility, and resistivity measurements to study single-crystal samples of K x Fe 2 − y Se 2 , which contain the superconducting phase that has a transition temperature of ∼ 31 K. In the inelastic neutron scattering measureme... [Phys. Rev. B 96, 094503] Published Wed Sep 06, 2017

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Energy spectrum of thermal counterflow turbulence in superfluid helium-4 (2017)

J. Gao, E. Varga, W. Guo, and W. F. Vinen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-13

Beschreibung: Author(s): J. Gao, E. Varga, W. Guo, and W. F. Vinen Recent preliminary experiments [A. Marakov et al. , Phys. Rev. B 91 , 094503 (2015) .] using triplet-state He 2 excimer molecules as tracers of the motion of the normal fluid have shown that, in thermal counterflow turbulence in superfluid He 4 , small-scale turbulence in the superfluid component is acco... [Phys. Rev. B 96, 094511] Published Tue Sep 12, 2017

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Nodal and nodeless gap in proximity-induced superconductivity: Application to monolayer ${\mathrm{CuO}}_{2}$ on a ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+δ}$ substrate (2017)

Yimeng Wang, Zhen-Hua Wang, and Wei-Qiang Chen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-16

Beschreibung: Author(s): Yimeng Wang, Zhen-Hua Wang, and Wei-Qiang Chen We present a detailed analysis on the hopping between monolayer CuO 2 and bulk CuO 2 plane in the Bi 2 Sr 2 CaCu 2 O 8 + δ substrate. With a two-band model, we demonstrate that the nodeless gap can only exist when the hole concentration in the monolayer CuO 2 plane is very large. We argue that the possible phas... [Phys. Rev. B 96, 104507] Published Fri Sep 15, 2017

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Supercurrent vortex pinball via a triplet Cooper pair inverse Edelstein effect (2017)

Morten Amundsen and Jacob Linder

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): Morten Amundsen and Jacob Linder We consider the Josephson effect through a thin spin-orbit coupled layer in the presence of an exchange field h and discover a set of supercurrent vortices appearing in the system which can be controllably moved around in the system by varying either the direction of h , the strength | h | , the spin-or... [Phys. Rev. B 96, 064508] Published Wed Aug 09, 2017

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Nonequilibrium optical conductivity: General theory and application to transient phases (2017)

D. M. Kennes, E. Y. Wilner, D. R. Reichman, and A. J. Millis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): D. M. Kennes, E. Y. Wilner, D. R. Reichman, and A. J. Millis A nonequilibrium theory of optical conductivity of dirty-limit superconductors and commensurate charge density wave is presented. We discuss the current response to different experimentally relevant light-field probe pulses and show that a single frequency definition of the optical conductivity σ ( ω ) ... [Phys. Rev. B 96, 054506] Published Mon Aug 07, 2017

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Modeling Bloch oscillations in nanoscale Josephson junctions (2017)

Heli Vora, R. L. Kautz, S. W. Nam, and J. Aumentado

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): Heli Vora, R. L. Kautz, S. W. Nam, and J. Aumentado Bloch oscillations in nanoscale Josephson junctions with a Coulomb charging energy comparable to the Josephson coupling energy are explored within the context of a model previously considered by Geigenmüller and Schön that includes Zener tunneling and treats quasiparticle tunneling as an explicit sh... [Phys. Rev. B 96, 054505] Published Mon Aug 07, 2017

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Electromagnetic response during quench dynamics to the superconducting state: Time-dependent Ginzburg-Landau analysis (2017)

D. M. Kennes and A. J. Millis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-12

Beschreibung: Author(s): D. M. Kennes and A. J. Millis We use a numerical solution of the deterministic time-dependent Ginzburg-Landau (TDGL) equations to determine the response induced by a probe field in a material quenched into a superconducting state. We characterize differences in response according to whether the probe is applied before, during, o... [Phys. Rev. B 96, 064507] Published Mon Aug 07, 2017

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Quasiparticle interference in multiband superconductors with strong coupling (2017)

A. Dutt, A. A. Golubov, O. V. Dolgov, and D. V. Efremov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-17

Beschreibung: Author(s): A. Dutt, A. A. Golubov, O. V. Dolgov, and D. V. Efremov We develop a theory of the quasiparticle interference (QPI) in multiband superconductors based on the strong-coupling Eliashberg approach within the Born approximation. In the framework of this theory, we study dependencies of the QPI response function in the multiband superconductors with the nodel... [Phys. Rev. B 96, 054513] Published Wed Aug 16, 2017

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Anisotropic thermomagnetic avalanche activity in field-cooled superconducting films (2017)

F. Colauto, D. Carmo, A. M. H. de Andrade, A. A. M. Oliveira, W. A. Ortiz, and T. H. Johansen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-17

Beschreibung: Author(s): F. Colauto, D. Carmo, A. M. H. de Andrade, A. A. M. Oliveira, W. A. Ortiz, and T. H. Johansen The electrodynamic behavior of isotropic superconducting Nb films cooled below their critical temperature in the presence of in-plane applied magnetic fields is investigated using magneto-optical imaging. A specially designed local flux injector is used to show that the frozen-in in-plane vortices s... [Phys. Rev. B 96, 060506(R)] Published Wed Aug 16, 2017

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Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates (2017)

Yan Wang, Louk Rademaker, Elbio Dagotto, and Steven Johnston

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-23

Beschreibung: Author(s): Yan Wang, Louk Rademaker, Elbio Dagotto, and Steven Johnston The discovery of an enhanced superconducting transition temperature T c in monolayers of FeSe grown on several oxide substrates has opened a different route to high- T c superconductivity through interface engineering. One proposal for the origin of the observed enhancement is an electron-phonon ( e -ph)... [Phys. Rev. B 96, 054515] Published Fri Aug 18, 2017

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Nonequilibrium interband phase textures induced by vortex splitting in two-band superconductors (2017)

A. S. Mosquera Polo, R. M. da Silva, A. Vagov, A. A. Shanenko, C. E. Deluque Toro, and J. Albino Aguiar

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-23

Beschreibung: Author(s): A. S. Mosquera Polo, R. M. da Silva, A. Vagov, A. A. Shanenko, C. E. Deluque Toro, and J. Albino Aguiar We demonstrate that in a weak-coupled two-band superconducting slab the interaction between vortices penetrating the sample and its boundaries leads to the phenomenon of vortex splitting, which divides composite vortices and creates fractional ones. The interaction between vortices, attractive for d... [Phys. Rev. B 96, 054517] Published Mon Aug 21, 2017

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${θ}_{0}$ thermal Josephson junction (2017)

M. A. Silaev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-23

Beschreibung: Author(s): M. A. Silaev We predict the thermal counterpart of the anomalous Josephson effect in superconductor/ferromagnet/superconductor junctions with noncoplanar magnetic texture. The heat current through the junction is shown to have the phase-sensitive interference component proportional to cos ( θ − θ 0 ) , where θ is the J... [Phys. Rev. B 96, 064519] Published Mon Aug 21, 2017

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Spectral linewidth of parallel Josephson junction array with intermediate-to-large damping (2017)

V. A. Shamporov, A. S. Myasnikov, E. V. Pankratova, and A. L. Pankratov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-24

Beschreibung: Author(s): V. A. Shamporov, A. S. Myasnikov, E. V. Pankratova, and A. L. Pankratov Spectral characteristics of THz generation in a parallel array of inductively coupled Josephson junctions with intermediate-to-large damping in the presence of thermal noise have been studied numerically. The influence of the number of junctions and coupling between them on the spectral linewidth ha... [Phys. Rev. B 96, 064522] Published Wed Aug 23, 2017

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Spin correlation and entanglement detection in Cooper pair splitters by current measurements using magnetic detectors (2017)

Piotr Busz, Damian Tomaszewski, and Jan Martinek

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-24

Beschreibung: Author(s): Piotr Busz, Damian Tomaszewski, and Jan Martinek We analyze a model of a double quantum dot Cooper pair splitter coupled to two ferromagnetic detectors and demonstrate the possibility of determination of spin correlation by current measurements. We use perturbation theory, taking account of the exchange interaction with the detectors, which leads ... [Phys. Rev. B 96, 064520] Published Tue Aug 22, 2017

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Superconducting and normal-state properties of the noncentrosymmetric superconductor ${\mathrm{Re}}_{6}\mathrm{Zr}$ (2017)

D. A. Mayoh, J. A. T. Barker, R. P. Singh, G. Balakrishnan, D. McK. Paul, and M. R. Lees

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-24

Beschreibung: Author(s): D. A. Mayoh, J. A. T. Barker, R. P. Singh, G. Balakrishnan, D. McK. Paul, and M. R. Lees We systematically investigate the normal and superconducting properties of noncentrosymmetric Re 6 Zr using magnetization, heat capacity, and electrical resistivity measurements. Resistivity measurements indicate Re 6 Zr has poor metallic behavior and is dominated by disorder. Re 6 Zr undergoes a supercon... [Phys. Rev. B 96, 064521] Published Tue Aug 22, 2017

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Collective modes and ultrasonic attenuation in a pseudogapped superconductor (2017)

A. V. Shtyk and M. V. Feigel'man

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-25

Beschreibung: Author(s): A. V. Shtyk and M. V. Feigel'man We develop a theory of collective modes in a model of strongly disordered s -wave superconductor with a localization-induced pseudogap Δ P , that is much larger than superconducting gap Δ . Then we applied the obtained results to the calculation of the ultrasound decay rate α ( ω ) at low-frequencies ω ≪ k B T ... [Phys. Rev. B 96, 064523] Published Thu Aug 24, 2017

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Slicing through both C-C and C-H bonds (2017)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-08-25

Schlagwort(e): Chemistry

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Optical imaging of surface chemistry and dynamics in confinement (2017)

Macias-Romero, C., Nahalka, I., Okur, H. I., Roke, S.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-08-25

Beschreibung: We imaged the interfacial structure and dynamics of water in a microscopically confined geometry, in three dimensions and on millisecond time scales, with a structurally illuminated wide-field second harmonic microscope. The second harmonic images reported on the orientational order of interfacial water, induced by charge-dipole interactions between water molecules and surface charges. The images were converted into surface potential maps. Spatially resolved surface acid dissociation constant (p K a,s ) values were determined for the silica deprotonation reaction by following pH-induced chemical changes on the curved and confined surfaces of a glass microcapillary immersed in aqueous solutions. These values ranged from 2.3 to 10.7 along the wall of a single capillary because of surface heterogeneities. Water molecules that rotate along an oscillating external electric field were also imaged.

Schlagwort(e): Chemistry

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Imaging surfaces with water (2017)

Szuromi, P.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-08-25

Schlagwort(e): Chemistry

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Broadening of the Berezinskii-Kosterlitz-Thouless transition by correlated disorder (2017)

I. Maccari, L. Benfatto, and C. Castellani

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-29

Beschreibung: Author(s): I. Maccari, L. Benfatto, and C. Castellani The Berezinskii-Kosterlitz-Thouless (BKT) transition in two-dimensional superconductors is usually expected to be protected against disorder. However, its fingerprints in a real system, such as, e.g., the universal superfluid-density jump, are often at odds with this expectation. Here, we show that ... [Phys. Rev. B 96, 060508(R)] Published Mon Aug 28, 2017

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A molecular dance to cleaner air (2017)

Janssens, T. V. W., Vennestrom, P. N. R.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-09-01

Schlagwort(e): Chemistry

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Dynamic multinuclear sites formed by mobilized copper ions in NOx selective catalytic reduction (2017)

Paolucci, C., Khurana, I., Parekh, A. A., Li, S., Shih, A. J., Li, H., Di Iorio, J. R., Albarracin-Caballero, J. D., Yezerets, A., Miller, J. T., Delgass, W. N., Ribeiro, F. H., Schneider, W. F., Gounder, R.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-09-01

Beschreibung: Copper ions exchanged into zeolites are active for the selective catalytic reduction (SCR) of nitrogen oxides (NO x ) with ammonia (NH 3 ), but the low-temperature rate dependence on copper (Cu) volumetric density is inconsistent with reaction at single sites. We combine steady-state and transient kinetic measurements, x-ray absorption spectroscopy, and first-principles calculations to demonstrate that under reaction conditions, mobilized Cu ions can travel through zeolite windows and form transient ion pairs that participate in an oxygen (O 2 )–mediated Cu I -〉Cu II redox step integral to SCR. Electrostatic tethering to framework aluminum centers limits the volume that each ion can explore and thus its capacity to form an ion pair. The dynamic, reversible formation of multinuclear sites from mobilized single atoms represents a distinct phenomenon that falls outside the conventional boundaries of a heterogeneous or homogeneous catalyst.

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Hydrogenation of fluoroarenes: Direct access to all-cis-(multi)fluorinated cycloalkanes (2017)

Wiesenfeldt, M. P., Nairoukh, Z., Li, W., Glorius, F.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-09-01

Beschreibung: All-c is -multifluorinated cycloalkanes exhibit intriguing electronic properties. In particular, they display extremely high dipole moments perpendicular to the aliphatic ring, making them highly desired motifs in material science. Very few such motifs have been prepared, as their syntheses require multistep sequences from diastereoselectively prefunctionalized precursors. Herein we report a synthetic strategy to access these valuable materials via the rhodium–cyclic (alkyl)(amino)carbene (CAAC)–catalyzed hydrogenation of readily available fluorinated arenes in hexane. This route enables the scalable single-step preparation of an abundance of multisubstituted and multifluorinated cycloalkanes, including all- cis -1,2,3,4,5,6-hexafluorocyclohexane as well as cis-configured fluorinated aliphatic heterocycles.

Schlagwort(e): Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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Raman study of electron-phonon coupling in thin films of the spinel oxide superconductor ${\mathrm{LiTi}}_{2}{\mathrm{O}}_{4}$ (2017)

D. Chen, Y.-L. Jia, T.-T. Zhang, Z. Fang, K. Jin, P. Richard, and H. Ding

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-06

Beschreibung: Author(s): D. Chen, Y.-L. Jia, T.-T. Zhang, Z. Fang, K. Jin, P. Richard, and H. Ding We performed a Raman scattering study of thin films of LiTi 2 O 4 spinel oxide superconductor. We detected four out of five Raman active modes, with frequencies in good accordance with our first-principles calculations. Three T 2 g modes show a Fano lineshape from 5 K to 295 K, which suggests an electron... [Phys. Rev. B 96, 094501] Published Tue Sep 05, 2017

Schlagwort(e): Superfluidity and superconductivity

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Superfluidity of dipolar excitons in a transition metal dichalcogenide double layer (2017)

Oleg L. Berman and Roman Ya. Kezerashvili

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-06

Beschreibung: Author(s): Oleg L. Berman and Roman Ya. Kezerashvili We study formation and superfluidity of dipolar excitons in double layer heterostructures formed by two transition metal dichalcogenide (TMDC) atomically thin layers. Considering screening effects for an electron-hole interaction via the harmonic oscillator approximation for the Keldysh potential, t... [Phys. Rev. B 96, 094502] Published Tue Sep 05, 2017

Schlagwort(e): Superfluidity and superconductivity

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Conservation of spin supercurrents in superconductors (2017)

Jabir Ali Ouassou, Sol H. Jacobsen, and Jacob Linder

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-08

Beschreibung: Author(s): Jabir Ali Ouassou, Sol H. Jacobsen, and Jacob Linder We demonstrate that spin supercurrents are conserved upon transmission through a conventional superconductor, even in the presence of spin-dependent scattering by impurities with magnetic moments or spin-orbit coupling. This is fundamentally different from conventional spin currents, which decay in ... [Phys. Rev. B 96, 094505] Published Thu Sep 07, 2017

Schlagwort(e): Superfluidity and superconductivity

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Pressure tuning of structure, superconductivity, and novel magnetic order in the Ce-underdoped electron-doped cuprate ${\mathrm{T}}^{{}^{′}}\text{−}{\mathrm{Pr}}_{1.3−x}{\mathrm{La}}_{0.7}{\mathrm{Ce}}_{x}{\mathrm{CuO}}_{4}$ ($x=0.1$) (2017)

Z. Guguchia, T. Adachi, Z. Shermadini, T. Ohgi, J. Chang, E. S. Bozin, F. von Rohr, A. M. dos Santos, J. J. Molaison, R. Boehler, Y. Koike, A. R. Wieteska, B. A. Frandsen, E. Morenzoni, A. Amato, S. J. L. Billinge, Y. J. Uemura, and R. Khasanov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-15

Beschreibung: Author(s): Z. Guguchia, T. Adachi, Z. Shermadini, T. Ohgi, J. Chang, E. S. Bozin, F. von Rohr, A. M. dos Santos, J. J. Molaison, R. Boehler, Y. Koike, A. R. Wieteska, B. A. Frandsen, E. Morenzoni, A. Amato, S. J. L. Billinge, Y. J. Uemura, and R. Khasanov High-pressure neutron powder diffraction, muon-spin rotation, and magnetization studies of the structural, magnetic, and the superconducting properties of the Ce-underdoped superconducting (SC) electron-doped cuprate system with the Nd 2 CuO 4 (the so-called T ′ ) structure T ′ − Pr 1.3 − x La 0.7 Ce x CuO 4 with x = ... [Phys. Rev. B 96, 094515] Published Thu Sep 14, 2017

Schlagwort(e): Superfluidity and superconductivity

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Theoretical study of stability and superconductivity of ${\mathrm{ScH}}_{n}$ ($n=4–8$) at high pressure (2017)

Shifeng Qian, Xiaowei Sheng, Xiaozhen Yan, Yangmei Chen, and Bo Song

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-15

Beschreibung: Author(s): Shifeng Qian, Xiaowei Sheng, Xiaozhen Yan, Yangmei Chen, and Bo Song The synthesis of hydrogen sulfides, with the potential of high-temperature superconductivity, was recently proposed at high T c = 203 K. It motivated us to employ an ab initio approach for the predictions of crystal structures to find the stable scandium hydrides. In addition to the earlier predicted... [Phys. Rev. B 96, 094513] Published Thu Sep 14, 2017

Schlagwort(e): Superfluidity and superconductivity

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Signature of multigap nodeless superconductivity in fluorine-doped NdFeAsO (2017)

A. Adamski, C. Krellner, and M. Abdel-Hafiez

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-15

Beschreibung: Author(s): A. Adamski, C. Krellner, and M. Abdel-Hafiez We investigate the temperature dependence of the lower critical field H c 1 ( T ) , the field at which vortices penetrate into the sample, of a high-quality fluorine-doped NdFeAsO single crystal under static magnetic fields H parallel to the c axis. The temperature dependence of the first vortex penetrati... [Phys. Rev. B 96, 100503(R)] Published Thu Sep 14, 2017

Schlagwort(e): Superfluidity and superconductivity

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Effect of proton irradiation on the normal-state low-energy excitations of $\mathbf{Ba}{({\mathbf{Fe}}_{1−x}{\mathbf{Rh}}_{x})}_{2}{\mathbf{As}}_{2}$ superconductors (2017)

M. Moroni, L. Gozzelino, G. Ghigo, M. A. Tanatar, R. Prozorov, P. C. Canfield, and P. Carretta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-20

Beschreibung: Author(s): M. Moroni, L. Gozzelino, G. Ghigo, M. A. Tanatar, R. Prozorov, P. C. Canfield, and P. Carretta We present a As 75 nuclear magnetic resonance (NMR) and resistivity study of the effect of 5.5 MeV proton irradiation on the optimal electron doped ( x = 0.068 ) and overdoped ( x = 0.107 ) Ba ( Fe 1 − x Rh x ) 2 As 2 iron based superconductors. While the proton induced defects only mildly suppress the critical tempera... [Phys. Rev. B 96, 094523] Published Tue Sep 19, 2017

Schlagwort(e): Superfluidity and superconductivity

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Tuning pairing amplitude and spin-triplet texture by curving superconducting nanostructures (2017)

Zu-Jian Ying, Mario Cuoco, Carmine Ortix, and Paola Gentile

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-21

Beschreibung: Author(s): Zu-Jian Ying, Mario Cuoco, Carmine Ortix, and Paola Gentile We investigate the nature of the superconducting (SC) state in curved nanostructures with Rashba spin-orbit coupling (RSOC). In bent nanostructures with inhomogeneous curvature we find a local enhancement or suppression of the SC order parameter, with the effect that can be tailored by tuning either... [Phys. Rev. B 96, 100506(R)] Published Wed Sep 20, 2017

Schlagwort(e): Superfluidity and superconductivity

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Critical fields and fluctuations determined from specific heat and magnetoresistance in the same nanogram SmFeAs(O,F) single crystal (2017)

S. Galeski, P. W. J. Moll, N. Zhigadlo, K. Mattenberger, and B. Batlogg

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-23

Beschreibung: Author(s): S. Galeski, P. W. J. Moll, N. Zhigadlo, K. Mattenberger, and B. Batlogg Through a direct comparison of specific heat and magnetoresistance, we critically asses the nature of superconducting fluctuations in the same nanogram crystal of SmFeAs(O,F). We show that although the superconducting fluctuation contribution to conductivity scales well within the two-dimensional lo... [Phys. Rev. B 96, 104511] Published Fri Sep 22, 2017

Schlagwort(e): Superfluidity and superconductivity

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Intrinsic superspin Hall current (2017)

Jacob Linder, Morten Amundsen, and Vetle Risinggård

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-14

Beschreibung: Author(s): Jacob Linder, Morten Amundsen, and Vetle Risinggård We discover an intrinsic superspin Hall current: an injected charge supercurrent in a Josephson junction containing heavy normal metals and a ferromagnet generates a transverse spin supercurrent. There is no accompanying dissipation of energy, in contrast to the conventional spin Hall effect. The ph... [Phys. Rev. B 96, 094512] Published Wed Sep 13, 2017

Schlagwort(e): Superfluidity and superconductivity

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Time-resolved spectral density of interacting fermions following a quench to a superconducting critical point (2017)

Yonah Lemonik and Aditi Mitra

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-14

Beschreibung: Author(s): Yonah Lemonik and Aditi Mitra Results are presented for the time evolution of fermions initially in a nonzero temperature normal phase, following the switch on of an attractive interaction. The dynamics are studied in the disordered phase close to the critical point, where the superfluid fluctuations are large. The analysis is c... [Phys. Rev. B 96, 104506] Published Wed Sep 13, 2017

Schlagwort(e): Superfluidity and superconductivity

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Optical signatures of the superconducting Goldstone mode in granular aluminum: Experiments and theory (2017)

Uwe S. Pracht, Tommaso Cea, Nimrod Bachar, Guy Deutscher, Eli Farber, Martin Dressel, Marc Scheffler, Claudio Castellani, Antonio M. García-García, and Lara Benfatto

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-16

Beschreibung: Author(s): Uwe S. Pracht, Tommaso Cea, Nimrod Bachar, Guy Deutscher, Eli Farber, Martin Dressel, Marc Scheffler, Claudio Castellani, Antonio M. García-García, and Lara Benfatto In ordinary superconductors the two collective modes of the complex order parameter are usually strongly resilient to the spectroscopic observation. The amplitude or Higgs mode is weakly coupled to the electromagnetic field and it overlaps with the continuum of single-particle excitations at 2 Δ , which buries its signal. The phase or Goldstone mode is optically inert, and it is boosted to the plasma frequency by Coulomb interactions. In the present work, terahertz experiments and theoretical calculations are combined in order to demonstrate the existence of an alternative route for the optical visibility of the Goldstone mode in a nanostructured granular Al thin film. The Coulomb screening due to the grains self-capacitance and the intrinsic inhomogeneity of the local superfluid stiffness due to shell effects lead to finite-frequency subgap absorption of the phase modes, showing that nanograins arrays are a promising setting to control the Goldstone mode via optical means. [Phys. Rev. B 96, 094514] Published Fri Sep 15, 2017

Schlagwort(e): Superfluidity and superconductivity

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Enhanced pinning for vortices in hyperuniform pinning arrays and emergent hyperuniform vortex configurations with quenched disorder (2017)

Q. Le Thien, D. McDermott, C. J. O. Reichhardt, and C. Reichhardt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-16

Beschreibung: Author(s): Q. Le Thien, D. McDermott, C. J. O. Reichhardt, and C. Reichhardt Disordered hyperuniformity is a state of matter exhibiting both isotropic liquid-like properties and crystalline-like properties such as minimal density fluctuations over long distances. Such states arise for jammed particle assemblies and in nonequilibrium systems. An open question is whether the p... [Phys. Rev. B 96, 094516] Published Fri Sep 15, 2017

Schlagwort(e): Superfluidity and superconductivity

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Pair breaking of multigap superconductivity under parallel magnetic fields in the electric-field-induced surface metallic state (2017)

Masahiro Nabeta, Kenta K. Tanaka, Seiichiro Onari, and Masanori Ichioka

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-20

Beschreibung: Author(s): Masahiro Nabeta, Kenta K. Tanaka, Seiichiro Onari, and Masanori Ichioka The roles of paramagnetic and diamagnetic pair-breaking effects in superconductivity in the electric-field-induced surface metallic state are studied using the Bogoliubov–de Gennes equation when magnetic fields are applied parallel to the surface. The multigap states of the subbands are related to t... [Phys. Rev. B 96, 094522] Published Tue Sep 19, 2017

Schlagwort(e): Superfluidity and superconductivity

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Theory of quantum-circuit refrigeration by photon-assisted electron tunneling (2017)

Matti Silveri, Hermann Grabert, Shumpei Masuda, Kuan Yen Tan, and Mikko Möttönen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-23

Beschreibung: Author(s): Matti Silveri, Hermann Grabert, Shumpei Masuda, Kuan Yen Tan, and Mikko Möttönen We focus on a recently experimentally realized scenario of normal-metal–insulator–superconductor tunnel junctions coupled to a superconducting resonator. We develop a first-principles theory to describe the effect of photon-assisted electron tunneling on the quantum state of the resonator. Our resul... [Phys. Rev. B 96, 094524] Published Fri Sep 22, 2017

Schlagwort(e): Superfluidity and superconductivity

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Observation of two-dimensional superconductivity in bilayers of ${\mathrm{BaBiO}}_{3}$ and ${\mathrm{BaPbO}}_{3}$ (2017)

B. Meir, S. Gorol, T. Kopp, and G. Hammerl

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-23

Beschreibung: Author(s): B. Meir, S. Gorol, T. Kopp, and G. Hammerl Lead-doped barium bismuthate is intriguing because of its relatively high critical temperature and the nature of its superconductivity in the vicinity of a charge-density-wave-ordered topological insulator. Here we present bilayers of barium bismuthate and barium leadate showing emergent superconduc... [Phys. Rev. B 96, 100507(R)] Published Thu Sep 21, 2017

Schlagwort(e): Superfluidity and superconductivity

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Modulation of the superconducting critical temperature due to quantum confinement at the ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ interface (2017)

D. Valentinis, S. Gariglio, A. Fête, J.-M. Triscone, C. Berthod, and D. van der Marel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-19

Beschreibung: Author(s): D. Valentinis, S. Gariglio, A. Fête, J.-M. Triscone, C. Berthod, and D. van der Marel Superconductivity develops in bulk doped SrTiO 3 and at the LaAlO 3 / SrTiO 3 interface with a dome-shaped density dependence of the critical temperature T c , despite different dimensionalities and geometries. We propose that the T c dome of LaAlO 3 / SrTiO 3 is a shape resonance due to quantum confinement of ... [Phys. Rev. B 96, 094518] Published Mon Sep 18, 2017

Schlagwort(e): Superfluidity and superconductivity

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Quasiparticle relaxation in superconducting nanostructures (2017)

Yahor Savich, Leonid Glazman, and Alex Kamenev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-21

Beschreibung: Author(s): Yahor Savich, Leonid Glazman, and Alex Kamenev We examine energy relaxation of nonequilibrium quasiparticles in “dirty” superconductors with the electron mean free path much shorter than the superconducting coherence length. Relaxation of low-energy nonequilibrium quasiparticles is dominated by phonon emission. We derive the corresponding collis... [Phys. Rev. B 96, 104510] Published Wed Sep 20, 2017

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Quantum oscillations in the SmFeAsO parent compound and superconducting SmFeAs(O,F) (2017)

F. Caglieris, A. Leveratto, I. Pallecchi, F. Bernardini, M. Fujioka, Y. Takano, L. Repetto, A. Jost, U. Zeitler, and M. Putti

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-09-19

Beschreibung: Author(s): F. Caglieris, A. Leveratto, I. Pallecchi, F. Bernardini, M. Fujioka, Y. Takano, L. Repetto, A. Jost, U. Zeitler, and M. Putti By carrying out magnetotransport measurements up to 30 T, we succeeded in detecting and analyzing quantitatively Shubnikov–de Haas oscillations in two crystals of the R E FeAsO ( R E = rare earth ) family of iron pnictides, namely, the undoped SmFeAsO and the superconducting fluorine underdoped SmFeAs(O,F).... [Phys. Rev. B 96, 104508] Published Mon Sep 18, 2017

Schlagwort(e): Superfluidity and superconductivity

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A charged approach to forming C-N bonds (2017)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-08-11

Schlagwort(e): Chemistry

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Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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High-temperature superconducting phase of HBr under pressure predicted by first-principles calculations (2017)

Qinyan Gu, Pengchao Lu, Kang Xia, Jian Sun, and Dingyu Xing

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-17

Beschreibung: Author(s): Qinyan Gu, Pengchao Lu, Kang Xia, Jian Sun, and Dingyu Xing The high pressure phases of HBr are explored with an ab initio crystal structure search. By taking into account the contribution of zero-point energy (ZPE), we find that the P 4 / n m m phase of HBr is thermodynamically stable in the pressure range from 150 to 200 GPa. The superconducting critical temper... [Phys. Rev. B 96, 064517] Published Wed Aug 16, 2017

Schlagwort(e): Superfluidity and superconductivity

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Spin-switch Josephson junctions with magnetically tunable sin($δφ/n$) current-phase relation (2017)

Jabir Ali Ouassou and Jacob Linder

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-17

Beschreibung: Author(s): Jabir Ali Ouassou and Jacob Linder With a combination of simple analytical arguments and extensive numerical simulations, we theoretically propose a Josephson junction with n + 1 superconductors where the current-phase relation can be toggled in situ between a sin ( δ φ ) and sin ( δ φ / n ) shape using an applied magnetic field. Focusing in par... [Phys. Rev. B 96, 064516] Published Wed Aug 16, 2017

Schlagwort(e): Superfluidity and superconductivity

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Andreev reflection in two-dimensional relativistic materials with realistic tunneling transparency in normal-metal/superconductor junctions (2017)

Yung-Yeh Chang, Chung-Yu Mou, and Chung-Hou Chung

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-23

Beschreibung: Author(s): Yung-Yeh Chang, Chung-Yu Mou, and Chung-Hou Chung The Andreev conductance across realistic two-dimensional (2D) normal-metal (N)/superconductor (SC) junctions with a relativistic Dirac spectrum is theoretically investigated within the Blonder-Tinkham-Klapwijk formalism with tunable tunneling transparency. It is known that due to the effect of Klein... [Phys. Rev. B 96, 054514] Published Thu Aug 17, 2017

Schlagwort(e): Superfluidity and superconductivity

Print ISSN: 1098-0121

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Thema: Physik

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Dipolar phonons and electronic screening in monolayer FeSe on ${\mathrm{SrTiO}}_{3}$ (2017)

Yuanjun Zhou and Andrew J. Millis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-23

Beschreibung: Author(s): Yuanjun Zhou and Andrew J. Millis Monolayer films of FeSe grown on SrTiO 3 substrates exhibit significantly higher superconducting transition temperatures than those of bulk FeSe. Interaction of electrons in the FeSe layer with dipolar SrTiO 3 phonons has been suggested as the cause of the enhanced transition temperature. In this pape... [Phys. Rev. B 96, 054516] Published Fri Aug 18, 2017

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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Longitudinal modes of spin fluctuations in iron-based superconductors (2017)

Qiang Zhang and Jiangping Hu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-24

Beschreibung: Author(s): Qiang Zhang and Jiangping Hu Iron-based superconductors can exhibit different magnetic ground states and are in a critical magnetic region where frustrated magnetic interactions strongly compete with each other. Here we investigate the longitudinal modes of spin fluctuations in a unified effective magnetic model for iron-based ... [Phys. Rev. B 96, 054518] Published Wed Aug 23, 2017

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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Magnetic and superconducting properties of a heavy-fermion ${\mathrm{CeCoIn}}_{5}$ epitaxial film probed by nuclear quadrupole resonance (2017)

Takayoshi Yamanaka, Masaaki Shimozawa, Hiroaki Shishido, Shunsaku Kitagawa, Hiroaki Ikeda, Takasada Shibauchi, Takahito Terashima, Yuji Matsuda, and Kenji Ishida

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-26

Beschreibung: Author(s): Takayoshi Yamanaka, Masaaki Shimozawa, Hiroaki Shishido, Shunsaku Kitagawa, Hiroaki Ikeda, Takasada Shibauchi, Takahito Terashima, Yuji Matsuda, and Kenji Ishida Since the progress in the fabrication techniques of thin films of exotic materials such as strongly correlated heavy-fermion compounds, microscopic studies of the magnetic and electronic properties inside the films have been needed. Herein, we report the observation of In 115 nuclear quadrupole reson... [Phys. Rev. B 96, 060507(R)] Published Fri Aug 25, 2017

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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Transport properties of ultrathin ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7−δ}$ nanowires: A route to single-photon detection (2017)

Riccardo Arpaia, Dmitri Golubev, Reza Baghdadi, Regina Ciancio, Goran Dražić, Pasquale Orgiani, Domenico Montemurro, Thilo Bauch, and Floriana Lombardi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-26

Beschreibung: Author(s): Riccardo Arpaia, Dmitri Golubev, Reza Baghdadi, Regina Ciancio, Goran Dražić, Pasquale Orgiani, Domenico Montemurro, Thilo Bauch, and Floriana Lombardi We report on the growth and characterization of ultrathin YBa 2 Cu 3 O 7 − δ (YBCO) films on MgO (110) substrates, which exhibit superconducting properties at thicknesses down to 3 nm. YBCO nanowires, with thicknesses down to 10 nm and widths down to 65 nm, have also been successfully fabricated. The nanow... [Phys. Rev. B 96, 064525] Published Fri Aug 25, 2017

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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Pressure-induced superconductivity up to 13.1 K in the pyrite phase of palladium diselenide $\mathrm{PdS}{\mathrm{e}}_{2}$ (2017)

Moaz A. El; Ghazali, Pavel G. Naumov, Hossein Mirhosseini, Vicky Süß, Lukas Müchler, Walter Schnelle, Claudia Felser, and Sergey A. Medvedev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-08-31

Beschreibung: Author(s): Moaz A. ElGhazali, Pavel G. Naumov, Hossein Mirhosseini, Vicky Süß, Lukas Müchler, Walter Schnelle, Claudia Felser, and Sergey A. Medvedev The family of transition-metal dichalcogenides provides a rich platform for studying the interplay between the crystal structure and electronic properties in strongly correlated electron systems. Applying external pressure as a tuning parameter, the authors observed a striking correlation between the critical temperature T c for superconductivity and the strength of the Se-Se bonds in the high-pressure pyrite phase of PdSe 2 . The bond length of the Se 2 dimer was identified as the main parameter for controlling the superconductivity in the pyrite structure. Strong pressure-induced enhancement of T c up to its maximum value of 13.1 K cannot, however, be explained solely by phonon softening, and this implies the relevance of additional factors influencing T c . Indeed, electronic band calculations reveal the presence of topologically nontrivial states in the pyrite structure. [Phys. Rev. B 96, 060509(R)] Published Wed Aug 30, 2017

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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Keeping all fluorines on the same side (2017)

Yeston, J.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-09-01

Schlagwort(e): Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

Publiziert von American Association for the Advancement of Science (AAAS)

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