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Quantum phase transition with a simple variational ansatz (2014)

Y. Lutsyshyn, G. E. Astrakharchik, C. Cazorla, and J. Boronat

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Y. Lutsyshyn, G. E. Astrakharchik, C. Cazorla, and J. Boronat We study the zero-temperature quantum phase transition between liquid and hcp solid 4 He. We use the variational method with a simple yet exchange-symmetric and fully explicit wave function. It is found that the optimized wave function undergoes spontaneous symmetry breaking and describes the quantum... [Phys. Rev. B 90, 214512] Published Thu Dec 11, 2014

Schlagwort(e): Superfluidity and superconductivity

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Meissner and mesoscopic superconducting states in 1–4 unit-cell FeSe films (2014)

L. Z. Deng, B. Lv, Z. Wu, Y. Y. Xue, W. H. Zhang, F. S. Li, L. L. Wang, X. C. Ma, Q. K. Xue, and C. W. Chu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): L. Z. Deng, B. Lv, Z. Wu, Y. Y. Xue, W. H. Zhang, F. S. Li, L. L. Wang, X. C. Ma, Q. K. Xue, and C. W. Chu We report a detailed investigation on the superconductivity in eight 1–4 unit-cell (UC) FeSe films on SrTiO 3 substrates by measuring their magnetization and sheet resistance in a field between 5×10 −2 and 7×10 4 Oe over the last one and a half years as a function of temperature and frequency, from 2 t... [Phys. Rev. B 90, 214513] Published Thu Dec 11, 2014

Schlagwort(e): Superfluidity and superconductivity

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Cluster algorithm for Monte Carlo simulations of spin ice (2014)

Hiromi Otsuka

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Hiromi Otsuka We present an algorithm for Monte Carlo simulations of a nearest-neighbor spin-ice model based on its cluster representation. To assess its performance, we estimate a relaxation time, and find that, in contrast to the Metropolis algorithm, our algorithm does not develop spin freezing. Also, to demon... [Phys. Rev. B 90, 220406] Published Thu Dec 11, 2014

Schlagwort(e): Magnetism

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Universal scaling of the critical temperature for thin films near the superconducting-to-insulating transition (2014)

Yachin Ivry, Chung-Soo Kim, Andrew E. Dane, Domenico De Fazio, Adam N. McCaughan, Kristen A. Sunter, Qingyuan Zhao, and Karl K. Berggren

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Yachin Ivry, Chung-Soo Kim, Andrew E. Dane, Domenico De Fazio, Adam N. McCaughan, Kristen A. Sunter, Qingyuan Zhao, and Karl K. Berggren Thin superconducting films form a unique platform for geometrically confined, strongly interacting electrons. They allow an inherent competition between disorder and superconductivity, which in turn enables the intriguing superconducting-to-insulating transition and is believed to facilitate the com... [Phys. Rev. B 90, 214515] Published Mon Dec 15, 2014

Schlagwort(e): Superfluidity and superconductivity

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Frustration and multicriticality in the antiferromagnetic spin-1 chain (2014)

J. H. Pixley, Aditya Shashi, and Andriy H. Nevidomskyy

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): J. H. Pixley, Aditya Shashi, and Andriy H. Nevidomskyy The antiferromagnetic spin-1 chain has a venerable history and has been thought to be well understood. Here, we show that inclusion of both next-nearest-neighbor (α) and biquadratic (β) interactions results in a rich phase diagram with a multicritical point that has not been observed before. We stud... [Phys. Rev. B 90, 214426] Published Mon Dec 15, 2014

Schlagwort(e): Magnetism

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Topological defects in systems with two competing order parameters: Application to superconductors with charge- and spin-density waves (2014)

Andreas Moor, Anatoly F. Volkov, and Konstantin B. Efetov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-17

Beschreibung: Author(s): Andreas Moor, Anatoly F. Volkov, and Konstantin B. Efetov On the basis of coupled Ginzburg-Landau equations we study nonhomogeneous states in systems with two order parameters (OPs). Superconductors with a superconducting OP Δ and a charge- or spin-density wave with amplitude W are examples of such systems. When one OP, say Δ, has a form of a topological d... [Phys. Rev. B 90, 224512] Published Tue Dec 16, 2014

Schlagwort(e): Superfluidity and superconductivity

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Kinetic pathways to the magnetic charge crystal in artificial dipolar spin ice (2014)

I. A. Chioar, B. Canals, D. Lacour, M. Hehn, B. Santos Burgos, T. O. Menteş, A. Locatelli, F. Montaigne, and N. Rougemaille

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): I. A. Chioar, B. Canals, D. Lacour, M. Hehn, B. Santos Burgos, T. O. Menteş, A. Locatelli, F. Montaigne, and N. Rougemaille The authors study a kagome artificial spin ice cooled from above its Curie temperature. They argue that the system after cooling, while appearing locally to be in the expected spin ice 2 phase, globally seems to be in some non-equilibrium state. [Phys. Rev. B 90, 220407] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Magnetic and electronic structure of the frustrated spin-chain compound linarite PbCuSO_{4}(OH)_{2} (2014)

M. Schäpers, H. Rosner, S.-L. Drechsler, S. Süllow, R. Vogel, B. Büchner, and A. U. B. Wolter

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): M. Schäpers, H. Rosner, S.-L. Drechsler, S. Süllow, R. Vogel, B. Büchner, and A. U. B. Wolter We present an extensive microscopic magnetic study of the quasi-one-dimensional frustrated s=1/2 spin-chain compound linarite. Angular-dependent susceptibility and 1 H-NMR measurements were performed at various temperatures in the paramagnetic state. All relevant NMR parameters, viz., the chemical, t... [Phys. Rev. B 90, 224417] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Spin-torque oscillators with thermal noise: A constant energy orbit approach (2014)

D. Pinna, D. L. Stein, and A. D. Kent

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): D. Pinna, D. L. Stein, and A. D. Kent We study the magnetization dynamics of spin-torque oscillators in the presence of thermal noise and as a function of the spin-polarization angle in a macrospin model. The macrospin has biaxial magnetic anisotropy, typical of thin film magnetic elements, with an easy axis in the film plane and a hard... [Phys. Rev. B 90, 174405] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Comment on “Superconductivity in electron-doped layered TiNCl with variable interlayer coupling” (2014)

Dale R. Harshman and Anthony T. Fiory

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Dale R. Harshman and Anthony T. Fiory In their article, Zhang et al. [Phys. Rev. B 86 , 024516 (2012)PRBMDO10.1103/PhysRevB.86.024516] present a remarkable result for Ax(S)yTiNCl compounds (α-phase TiNCl partially intercalated with alkali A and optionally co-intercalated molecular species S), finding the superconducting transition temper... [Phys. Rev. B 90, 186501] Published Thu Nov 06, 2014

Schlagwort(e): Superfluidity and superconductivity

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Reply to “Comment on ‘Superconductivity in electron-doped layered TiNCl with variable interlayer coupling' ” (2014)

S. Zhang, Masashi Tanaka, and Shoji Yamanaka

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): S. Zhang, Masashi Tanaka, and Shoji Yamanaka We have studied the electron-doped α-form TiNCl (FeOCl orthorhombic type) in detail and have found the transition temperature Tc of 18.0 K decreases monotonically with increasing the interlayer spacing d upon co-intercalation of various kinds of organic solvent molecules with alkali atoms. We conclu... [Phys. Rev. B 90, 186502] Published Thu Nov 06, 2014

Schlagwort(e): Superfluidity and superconductivity

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Heisenberg-like ferromagnetism in 3d-4f intermetallic La0.75Pr0.25Co2P2 with localized Co moments (2014)

P. Lampen, M. H. Phan, H. Srikanth, K. Kovnir, P. Chai, and M. Shatruk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): P. Lampen, M. H. Phan, H. Srikanth, K. Kovnir, P. Chai, and M. Shatruk The critical behavior near the continuous paramagnetic to ferromagnetic transition in a single crystal of La0.75Pr0.25Co2P2 has been determined based on high-resolution bulk magnetization data near TC ∼ 167 K, where long-range order is established in the Co sublattice. Scaling equation of state anal... [Phys. Rev. B 90, 174404] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Quasiparticle breakdown in the quasi-one-dimensional Ising ferromagnet CoNb2O6 (2014)

Neil J. Robinson, Fabian H. L. Essler, Ivelisse Cabrera, and Radu Coldea

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Neil J. Robinson, Fabian H. L. Essler, Ivelisse Cabrera, and Radu Coldea We present experimental and theoretical evidence that an interesting quantum many-body effect—quasiparticle breakdown—occurs in the quasi-one-dimensional spin-12 Ising-like ferromagnet CoNb2O6 in its paramagnetic phase at high transverse field as a result of explicit breaking of spin inversion symme... [Phys. Rev. B 90, 174406] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Multipole order and global/site symmetry in the hidden-order phase of URu2Si2 (2014)

Michi-To Suzuki and Hiroaki Ikeda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Michi-To Suzuki and Hiroaki Ikeda On the basis of group theory and first-principles calculations, we investigate high-rank multipole orderings in URu2Si2, which have been proposed as a genuine primary order parameter in the hidden-order phase below 17.5 K. We apply Shubnikov group theory to the multipole ordered states characterized... [Phys. Rev. B 90, 184407] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Freezing a quantum magnet by repeated quantum interference: An experimental realization (2014)

Swathi S. Hegde, Hemant Katiyar, T. S. Mahesh, and Arnab Das

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Swathi S. Hegde, Hemant Katiyar, T. S. Mahesh, and Arnab Das We experimentally demonstrate the phenomenon of dynamical many-body freezing in a periodically driven Ising chain. Theoretically [A. Das, Phys. Rev. B 82 , 172402 (2010)PRBMDO10.1103/PhysRevB.82.172402], for certain values of the drive parameters all fundamental degrees of freedom contributing to the... [Phys. Rev. B 90, 174407] Published Fri Nov 07, 2014

Schlagwort(e): Magnetism

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Majorana vortex-bound states in three-dimensional nodal noncentrosymmetric superconductors (2014)

Po-Yao Chang, Shunji Matsuura, Andreas P. Schnyder, and Shinsei Ryu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Po-Yao Chang, Shunji Matsuura, Andreas P. Schnyder, and Shinsei Ryu Noncentrosymmetric superconductors (NCSs), characterized by antisymmetric spin-orbit coupling and a mixture of spin-singlet and spin-triplet pairing components, are promising candidate materials for topological superconductivity. An important hallmark of topological superconductors is the existence ... [Phys. Rev. B 90, 174504] Published Fri Nov 07, 2014

Schlagwort(e): Superfluidity and superconductivity

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Fermi-surface reconstruction and transport coefficients from a mean-field bidirectional charge-density wave state in the high-Tc cuprates (2014)

Kangjun Seo and Sumanta Tewari

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Kangjun Seo and Sumanta Tewari The recent discovery of an incipient charge-density wave (CDW) instability competing with superconductivity in a class of high-temperature cuprate superconductors has brought the role of charge order in the phase diagram of the cuprates under renewed focus. Here, we take a mean field Q1=(2π/3,0) and... [Phys. Rev. B 90, 174503] Published Fri Nov 07, 2014

Schlagwort(e): Superfluidity and superconductivity

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Observation of pseudogaplike feature above Tc in LiFeAs by ultrafast optical spectroscopy (2014)

Kung-Hsuan Lin (林宮玄), Kuan-Jen Wang (王冠仁), Chung-Chieh Chang (張忠傑), Yu-Chieh Wen (溫昱傑), Dzung-Han Tsai (蔡宗翰), Yu-Ruei Wu (吳育叡), Yao-Tsung Hsieh (謝曜聰), Ming-Jye Wang (王明杰), Bing Lv (吕兵), Paul Ching-Wu Chu (朱經武), and Maw-Kuen Wu (吳茂昆)

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Kung-Hsuan Lin (林宮玄), Kuan-Jen Wang (王冠仁), Chung-Chieh Chang (張忠傑), Yu-Chieh Wen (溫昱傑), Dzung-Han Tsai (蔡宗翰), Yu-Ruei Wu (吳育叡), Yao-Tsung Hsieh (謝曜聰), Ming-Jye Wang (王明杰), Bing Lv (吕兵), Paul Ching-Wu Chu (朱經武), and Maw-Kuen Wu (吳茂昆) We utilize ultrafast optical spectroscopy to study the quasiparticle relaxation in stoichiometric LiFeAs crystals. According to our temperature-dependent studies, we have observed three electronic phases in LiFeAs. Below the superconducting (SC) temperature Tc (=15 K), the relaxation time of quasipa... [Phys. Rev. B 90, 174502] Published Fri Nov 07, 2014

Schlagwort(e): Superfluidity and superconductivity

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Josephson junctions with tunable current-phase relation (2014)

A. Lipman, R. G. Mints, R. Kleiner, D. Koelle, and E. Goldobin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): A. Lipman, R. G. Mints, R. Kleiner, D. Koelle, and E. Goldobin We consider 0-π Josephson junctions consisting of 0 and π regions of lengths L0 and Lπ with critical current densities jc0 and jcπ, respectively. The dependence of the Josephson current on the phase-shift averaged along the junction is derived. We show that these systems exhibit the main features of... [Phys. Rev. B 90, 184502] Published Fri Nov 07, 2014

Schlagwort(e): Superfluidity and superconductivity

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Magnetic order and spin dynamics in La2O2Fe2OSe2 probed by Fe57 Mössbauer, La139 NMR, and muon-spin relaxation spectroscopy (2014)

M. Günther, S. Kamusella, R. Sarkar, T. Goltz, H. Luetkens, G. Pascua, S.-H. Do, K.-Y. Choi, H. D. Zhou, C. G. F. Blum, S. Wurmehl, B. Büchner, and H.-H. Klauss

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): M. Günther, S. Kamusella, R. Sarkar, T. Goltz, H. Luetkens, G. Pascua, S.-H. Do, K.-Y. Choi, H. D. Zhou, C. G. F. Blum, S. Wurmehl, B. Büchner, and H.-H. Klauss We present a detailed local probe study of the magnetic order in the oxychalcogenide La2O2Fe2OSe2 utilizing Fe57 Mössbauer, La139 NMR, and muon-spin relaxation spectroscopy. This system can be regarded as an insulating reference system of the Fe arsenide and chalcogenide superconductors. From the co... [Phys. Rev. B 90, 184408] Published Fri Nov 07, 2014

Schlagwort(e): Magnetism

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Perpendicular magnetic anisotropy in CoFe/MgO/CoFe magnetic tunnel junctions by first-principles calculations (2014)

Jia Zhang, Christian Franz, Michael Czerner, and Christian Heiliger

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Jia Zhang, Christian Franz, Michael Czerner, and Christian Heiliger The magnetic anisotropy in FexCo100−x/MgO/FexCo100−x magnetic tunnel junctions as a function of composition is investigated on different substrates (Cu, Ag, and MgO). We use the full relativistic screened-Korringa-Kohn-Rostoker method and employ the coherent potential approximation for description o... [Phys. Rev. B 90, 184409] Published Fri Nov 07, 2014

Schlagwort(e): Magnetism

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Magnetization plateaus and jumps in a frustrated four-leg spin tube under a magnetic field (2014)

F. A. Gómez Albarracín, M. Arlego, and H. D. Rosales

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-05

Beschreibung: Author(s): F. A. Gómez Albarracín, M. Arlego, and H. D. Rosales We study the ground state phase diagram of a frustrated spin-1/2 four-leg spin tube in an external magnetic field. We explore the parameter space of this model in the regime of all-antiferromagnetic exchange couplings by means of three different approaches: analysis of low-energy effective Hamiltoni... [Phys. Rev. B 90, 174403] Published Tue Nov 04, 2014

Schlagwort(e): Magnetism

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Conductance anomalies of CoFeB/MgO/CoFeB magnetic tunnel junctions (2014)

S. Ringer, M. Vieth, L. Bär, M. Rührig, and G. Bayreuther

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): S. Ringer, M. Vieth, L. Bär, M. Rührig, and G. Bayreuther The I-V characteristics of CoFeB/MgO/CoFeB magnetic tunnel junctions show pronounced nonlinearities which are relevant both for sensor applications and for the basic understanding of spin-dependent tunneling. To study the relation between the tunnel characteristics and the tunnel magnetoresistance (... [Phys. Rev. B 90, 174401] Published Mon Nov 03, 2014

Schlagwort(e): Magnetism

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Enhanced self-diffusion of adsorbed methanol in silica aerogel (2014)

Jeongseop A. Lee, A. M. Mounce, Sangwon Oh, A. M. Zimmerman, and W. P. Halperin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): Jeongseop A. Lee, A. M. Mounce, Sangwon Oh, A. M. Zimmerman, and W. P. Halperin Nuclear magnetic resonance techniques are used to study anomalously high diffusion of methanol in porous silica aerogel. [Phys. Rev. B 90, 174501] Published Mon Nov 03, 2014

Schlagwort(e): Superfluidity and superconductivity

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Exchange splitting of surface and bulk electronic states in excited magnetic states of Gd: First-principles study (2014)

L. M. Sandratskii

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): L. M. Sandratskii Recent pump-probe experiments provide time evolution of the bulk and surface electronic states in Gd excited by the laser pulse. These experiments are in close connection with earlier spectroscopic experiments probing temperature dependence of the exchange splitting of the electronic states. We repo... [Phys. Rev. B 90, 184406] Published Wed Nov 05, 2014

Schlagwort(e): Magnetism

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Transport measurements of the spin-wave parameters of thin Mn films (2014)

S. Buvaev, S. Ghosh, K. Muttalib, P. Wölfle, and A. Hebard

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): S. Buvaev, S. Ghosh, K. Muttalib, P. Wölfle, and A. Hebard This paper provides an experimental description and theoretical explanation of how disorder affects electronic transport in antiferromagnetic thin films. The authors find a quantum correction to the conductivity which survives to high disorder strength because of a high rate of inelastic scattering of electrons off of gapped antiferromagnetic spin waves. The data provide first-time estimates of the spin-wave energy gap and exchange energy derived solely from transport measurements. The focus on the unexplored effect of antiferromagnetism on electronic transport provides new perspectives on the role of electronic transport and spin alignment in disordered magnetic systems. [Phys. Rev. B 90, 214429] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Experimental and numerical understanding of localized spin wave mode behavior in broadly tunable spatially complex magnetic configurations (2014)

Chunhui Du, Rohan Adur, Hailong Wang, Sergei A. Manuilov, Fengyuan Yang, Denis V. Pelekhov, and P. Chris Hammel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): Chunhui Du, Rohan Adur, Hailong Wang, Sergei A. Manuilov, Fengyuan Yang, Denis V. Pelekhov, and P. Chris Hammel Spin wave modes confined in a ferromagnetic film by the spatially inhomogeneous magnetic field generated by a scanned micromagnetic tip of a ferromagnetic resonance force microscope (FMRFM) enable microscopic imaging of the internal fields and spin dynamics in nanoscale magnetic devices. Here we rep... [Phys. Rev. B 90, 214428] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Pressure-enhanced superconductivity in Eu_{3}Bi_{2}S_{4}F_{4} (2014)

Yongkang Luo, Hui-Fei Zhai, Pan Zhang, Zhu-An Xu, Guang-Han Cao, and J. D. Thompson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): Yongkang Luo, Hui-Fei Zhai, Pan Zhang, Zhu-An Xu, Guang-Han Cao, and J. D. Thompson The pressure effect on the newly discovered charge-transferred BiS 2 -based superconductor, Eu 3 Bi 2 S 4 F 4 , with a T c of 1.5 K at ambient pressure, is investigated by transport and magnetic measurements. Accompanied with the enhancement of metallicity under pressures, the onset superconducting transition ... [Phys. Rev. B 90, 220510] Published Wed Dec 17, 2014

Schlagwort(e): Superfluidity and superconductivity

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Terahertz emission spectroscopy of laser-induced spin dynamics in TmFeO3 and ErFeO3 orthoferrites (2014)

R. V. Mikhaylovskiy, E. Hendry, V. V. Kruglyak, R. V. Pisarev, Th. Rasing, and A. V. Kimel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): R. V. Mikhaylovskiy, E. Hendry, V. V. Kruglyak, R. V. Pisarev, Th. Rasing, and A. V. Kimel Using the examples of laser-induced spin-reorientation phase transitions in TmFeO3 and ErFeO3 orthoferrites, we demonstrate that terahertz emission spectroscopy can obtain novel information about ultrafast laser-induced spin dynamics, which is not accessible by more common all-optical methods. The p... [Phys. Rev. B 90, 184405] Published Wed Nov 05, 2014

Schlagwort(e): Magnetism

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Nonlocal transport mediated by spin supercurrents (2014)

Hua Chen, Andrew D. Kent, Allan H. Mac; Donald, and Inti Sodemann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): Hua Chen, Andrew D. Kent, Allan H. MacDonald, and Inti Sodemann In thin-film ferromagnets with perfect easy-plane anisotropy, the component of total spin perpendicular to the easy plane is a good quantum number and the corresponding spin supercurrent can flow without dissipation. Here we explain how spin supercurrents couple spatially remote spin-mixing vertical... [Phys. Rev. B 90, 220401] Published Mon Dec 01, 2014

Schlagwort(e): Magnetism

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Internal static electric and magnetic field at the copper cite in a single crystal of the electron-doped high-T_{c} superconductor Pr_{1.85}Ce_{0.15}CuO_{4−y} (2014)

Guoqing Wu, F. Zamborszky, A. P. Reyes, P. L. Kuhns, R. L. Greene, and W. G. Clark

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): Guoqing Wu, F. Zamborszky, A. P. Reyes, P. L. Kuhns, R. L. Greene, and W. G. Clark We report 63,65 Cu-NMR spectroscopy and Knight shift measurements on a single crystal of the electron-doped high-T c superconductor Pr 1.85 Ce 0.15 CuO 4−y with an applied magnetic field (H) up to 26.42 T. A very small NQR frequency is obtained with the observation of the spectrum, which shows an extremely... [Phys. Rev. B 90, 214506] Published Thu Dec 04, 2014

Schlagwort(e): Superfluidity and superconductivity

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Anomalous spin dynamics in CdCu_{2}(BO_{3})_{2} revealed by ^{11}B NMR and ZF-μSR (2014)

W.-J. Lee, S.-H. Do, Sungwon Yoon, Z. H. Jang, B. J. Suh, J. H. Lee, A. P. Reyes, P. L. Kuhns, H. Luetkens, and K.-Y. Choi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): W.-J. Lee, S.-H. Do, Sungwon Yoon, Z. H. Jang, B. J. Suh, J. H. Lee, A. P. Reyes, P. L. Kuhns, H. Luetkens, and K.-Y. Choi We report 11 B nuclear magnetic resonance (NMR) and zero-field muon spin relaxation (ZF-μSR) measurements of the anisotropic spin tetramer system CdCu 2 (BO 3 ) 2 , which consists of strongly interacting Cu(1) dimers and weakly coupled nonfrustrated Cu(2) spins. Long-range magnetic order is observed at T ... [Phys. Rev. B 90, 214416] Published Thu Dec 04, 2014

Schlagwort(e): Magnetism

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Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates (2014)

M. P. M. Dean, A. J. A. James, A. C. Walters, V. Bisogni, I. Jarrige, M. Hücker, E. Giannini, M. Fujita, J. Pelliciari, Y. B. Huang, R. M. Konik, T. Schmitt, and J. P. Hill

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): M. P. M. Dean, A. J. A. James, A. C. Walters, V. Bisogni, I. Jarrige, M. Hücker, E. Giannini, M. Fujita, J. Pelliciari, Y. B. Huang, R. M. Konik, T. Schmitt, and J. P. Hill The cuprate high temperature superconductors exhibit a pronounced trend in which the superconducting transition temperature T c increases with the number of CuO 2 planes n in the crystal structure. We compare the magnetic excitation spectrum of Bi 2+x Sr 2−x CuO 6+δ (Bi-2201) and Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ (Bi-2223... [Phys. Rev. B 90, 220506] Published Thu Dec 04, 2014

Schlagwort(e): Superfluidity and superconductivity

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Quantum theory of the inverse Faraday effect (2014)

M. Battiato, G. Barbalinardo, and P. M. Oppeneer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): M. Battiato, G. Barbalinardo, and P. M. Oppeneer We provide a quantum theoretical description of the magnetic polarization induced by intense circularly polarized light in a material. Such effect—commonly referred to as the inverse Faraday effect—is treated using beyond-linear response theory, considering the applied electromagnetic field as exter... [Phys. Rev. B 89, 014413] Published Tue Jan 14, 2014

Schlagwort(e): Magnetism

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Rotatable magnetic anisotropy in a Fe0.8Ga0.2 thin film with stripe domains: Dynamics versus statics (2014)

S. Tacchi, S. Fin, G. Carlotti, G. Gubbiotti, M. Madami, M. Barturen, M. Marangolo, M. Eddrief, D. Bisero, A. Rettori, and M. G. Pini

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): S. Tacchi, S. Fin, G. Carlotti, G. Gubbiotti, M. Madami, M. Barturen, M. Marangolo, M. Eddrief, D. Bisero, A. Rettori, and M. G. Pini A comprehensive investigation of rotatable anisotropy in a Fe0.8Ga0.2 thin film with a stripe domain structure has been performed comparing static and dynamic measurements. The stripes' domain formation and their rotation under a transverse magnetic field have been imaged by magnetic force microscop... [Phys. Rev. B 89, 024411] Published Tue Jan 14, 2014

Schlagwort(e): Magnetism

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Unconventional sign-changing superconductivity near quantum criticality in YFe2Ge2 (2014)

Alaska Subedi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): Alaska Subedi I present the results of first principles calculations of the electronic structure and magnetic interactions for the recently discovered superconductor YFe2Ge2 and use them to identify the possible nature of superconductivity and quantum criticality in this compound. I find that the Fe 3d derived st... [Phys. Rev. B 89, 024504] Published Tue Jan 14, 2014

Schlagwort(e): Superfluidity and superconductivity

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Localization of charge carriers in the normal state of underdoped Bi2+xSr2−xCuO6+δ (2014)

Huiqian Luo and Hai-Hu Wen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): Huiqian Luo and Hai-Hu Wen We report the transport results of underdoped Bi2+xSr2−xCuO6+δ (0.05≤x≤0.40) single crystals. A close relationship between the upturn of in-plane resistivity [ρab(T)] and the sign of magnetoresistance in the normal state upon Bi substitutions is found. Combining the results of the field and angular ... [Phys. Rev. B 89, 024506] Published Tue Jan 14, 2014

Schlagwort(e): Superfluidity and superconductivity

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Propagation of thermally induced magnonic spin currents (2014)

Ulrike Ritzmann, Denise Hinzke, and Ulrich Nowak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): Ulrike Ritzmann, Denise Hinzke, and Ulrich Nowak The propagation of magnons in temperature gradients is investigated within the framework of an atomistic spin model with the stochastic Landau-Lifshitz-Gilbert equation as underlying equation of motion. We analyze the magnon accumulation, the magnon temperature profile, as well as the propagation le... [Phys. Rev. B 89, 024409] Published Mon Jan 13, 2014

Schlagwort(e): Magnetism

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Tenth-order high-temperature expansion for the susceptibility and the specific heat of spin-s Heisenberg models with arbitrary exchange patterns: Application to pyrochlore and kagome magnets (2014)

Andre Lohmann, Heinz-Jürgen Schmidt, and Johannes Richter

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Andre Lohmann, Heinz-Jürgen Schmidt, and Johannes Richter We present the high-temperature expansion (HTE) up to tenth order of the specific heat C and the uniform susceptibility χ for Heisenberg models with arbitrary exchange patterns and arbitrary spin quantum number s. We encode the algorithm in a c++ program provided in the Supplemental Material [http:/... [Phys. Rev. B 89, 014415] Published Wed Jan 15, 2014

Schlagwort(e): Magnetism

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Cluster functional renormalization group (2014)

Johannes Reuther and Ronny Thomale

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Johannes Reuther and Ronny Thomale Functional renormalization group (FRG) has become a diverse and powerful tool to derive effective low-energy scattering vertices of interacting many-body systems. Starting from a free expansion point of the action, the flow of the RG parameter Λ allows us to trace the evolution of the effective one-... [Phys. Rev. B 89, 024412] Published Wed Jan 15, 2014

Schlagwort(e): Magnetism

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Domain wall motion in junctions of thin-film magnets and topological insulators (2014)

Yago Ferreiros and Alberto Cortijo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): Yago Ferreiros and Alberto Cortijo We derive the equations of motionof a domain wall in a thin-film magnet coupled to the surface states of a topological insulator, in the presence of both an electric field along the domain wall and a magnetic field perpendicular to the junction. We show how the electric field acts as a chirality sta... [Phys. Rev. B 89, 024413] Published Fri Jan 17, 2014

Schlagwort(e): Magnetism

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Observation of lock-in phenomena in heavy-ion-irradiated single crystal of Ba(Fe0.93Co0.07)2As2 (2014)

Toshihiro Taen, Hidenori Yagyuda, Yasuyuki Nakajima, Tsuyoshi Tamegai, Oscar Ayala-Valenzuela, Leonardo Civale, Boris Maiorov, Tadashi Kambara, and Yasuyuki Kanai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Toshihiro Taen, Hidenori Yagyuda, Yasuyuki Nakajima, Tsuyoshi Tamegai, Oscar Ayala-Valenzuela, Leonardo Civale, Boris Maiorov, Tadashi Kambara, and Yasuyuki Kanai The angular dependence of magnetization was measured in an optimally Co-doped BaFe2As2 single crystal, which is irradiated by 2.6 GeV uranium to introduce columnar defects (CDs). At low fields (H), we observe the irreversible magnetization Mirr insensitive to the angle θ around H∥CDs. The field depe... [Phys. Rev. B 89, 024508] Published Wed Jan 22, 2014

Schlagwort(e): Superfluidity and superconductivity

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Shape resonances and shell effects in thin-film multiband superconductors (2014)

Aurelio Romero-Bermúdez and Antonio M. García-García

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Aurelio Romero-Bermúdez and Antonio M. García-García We study analytically the evolution of superconductivity in clean quasi-two-dimensional multiband superconductors as the film thickness enters the nanoscale region by mean-field and semiclassical techniques. Tunneling into the substrate and finite lateral size effects, which are important in experim... [Phys. Rev. B 89, 024510] Published Wed Jan 22, 2014

Schlagwort(e): Superfluidity and superconductivity

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Superconductivity in LiFeO2Fe2Se2 with anti-PbO-type spacer layers (2014)

X. F. Lu, N. Z. Wang, G. H. Zhang, X. G. Luo, Z. M. Ma, B. Lei, F. Q. Huang, and X. H. Chen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): X. F. Lu, N. Z. Wang, G. H. Zhang, X. G. Luo, Z. M. Ma, B. Lei, F. Q. Huang, and X. H. Chen We report on a superconductor LiFeO2Fe2Se2 with Tc∼43 K, synthesized via the hydrothermal method. The anti-PbO-type spacer layer of LiFeO2 has been successfully intercalated between the anti-PbO-type FeSe layer, which results in a high-Tc superconductivity in this iron selenide material. In this mat... [Phys. Rev. B 89, 020507] Published Wed Jan 22, 2014

Schlagwort(e): Superfluidity and superconductivity

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Orbital-selective superconductivity, gap anisotropy, and spin resonance excitations in a multiorbital t-J1-J2 model for iron pnictides (2014)

Rong Yu, Jian-Xin Zhu, and Qimiao Si

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Rong Yu, Jian-Xin Zhu, and Qimiao Si We study the orbital-selective superconducting pairing in a five-orbital t-J1-J2 model for iron pnictides. Depending on the orbital selectivity of electron correlations and the orbital characters along the Fermi surface, the superconducting gap in an A1g pairing state may exhibit anisotropy. This an... [Phys. Rev. B 89, 024509] Published Wed Jan 22, 2014

Schlagwort(e): Superfluidity and superconductivity

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Ferromagnetic vortex core switching at elevated temperatures (2014)

Kristof M. Lebecki and Ulrich Nowak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): Kristof M. Lebecki and Ulrich Nowak An approach for the investigation of vortex core switching is presented. Thermal effects up to the Curie point are included in a micromagnetic framework based on the recently developed Landau-Lifshitz-Bloch equation. In this approach it is easier to avoid numerical discretization artifacts, commonly... [Phys. Rev. B 89, 014421] Published Thu Jan 23, 2014

Schlagwort(e): Magnetism

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Characterization of the spin-12 linear-chain ferromagnet CuAs2O4 (2014)

K. Caslin, R. K. Kremer, F. S. Razavi, A. Schulz, A. Muñoz, F. Pertlik, J. Liu, M.-H. Whangbo, and J. M. Law

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): K. Caslin, R. K. Kremer, F. S. Razavi, A. Schulz, A. Muñoz, F. Pertlik, J. Liu, M.-H. Whangbo, and J. M. Law The magnetic and lattice properties of the S=1/2 quantum-spin-chain ferromagnet CuAs2O4, mineral name trippkeite, were investigated. The crystal structure of CuAs2O4 is characterized by the presence of corrugated CuO2 ribbon chains. Measurements of the magnetic susceptibility, heat capacity, electro... [Phys. Rev. B 89, 014412] Published Mon Jan 13, 2014

Schlagwort(e): Magnetism

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Symmetry of the charge density wave in cuprates (2014)

Ashot Melikyan and M. R. Norman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): Ashot Melikyan and M. R. Norman We derive and analyze an effective Ginzburg-Landau (GL) functional for a charge density wave for a model of electrons on a tight-binding square lattice with density-density interactions. We show, using realistic electronic dispersions for the cuprates, that for the simplest GL theory, the preferred ... [Phys. Rev. B 89, 024507] Published Thu Jan 16, 2014

Schlagwort(e): Superfluidity and superconductivity

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High-temperature magnetoelectricity of terbium aluminum borate: The role of excited states of the rare-earth ion (2014)

A. M. Kadomtseva, Yu. F. Popov, G. P. Vorob'ev, N. V. Kostyuchenko, A. I. Popov, A. A. Mukhin, V. Yu. Ivanov, L. N. Bezmaternykh, I. A. Gudim, V. L. Temerov, A. P. Pyatakov, and A. K. Zvezdin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): A. M. Kadomtseva, Yu. F. Popov, G. P. Vorob'ev, N. V. Kostyuchenko, A. I. Popov, A. A. Mukhin, V. Yu. Ivanov, L. N. Bezmaternykh, I. A. Gudim, V. L. Temerov, A. P. Pyatakov, and A. K. Zvezdin Recently discovered magnetoelectricity in the rare-earth aluminum borates RAl3(BO3)4 has attracted attention due to the large values of magnetoinduced electric polarization. We have observed for the first time the magnetoelectric polarization in TbAl3(BO3)4 exhibiting anomalous temperature dependenc... [Phys. Rev. B 89, 014418] Published Tue Jan 21, 2014

Schlagwort(e): Magnetism

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Evidence for a charge collective mode associated with superconductivity in copper oxides from neutron and x-ray scattering measurements of La2−xSrxCuO4 (2014)

S. R. Park, T. Fukuda, A. Hamann, D. Lamago, L. Pintschovius, M. Fujita, K. Yamada, and D. Reznik

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): S. R. Park, T. Fukuda, A. Hamann, D. Lamago, L. Pintschovius, M. Fujita, K. Yamada, and D. Reznik In superconducting copper oxides, some Cu-O bond-stretching phonons around 70 meV show anomalous giant softening and broadening of electronic origin, and electronic dispersions have large renormalization kinks near the same energy. These observations suggest that phonon broadening originates from qu... [Phys. Rev. B 89, 020506] Published Tue Jan 21, 2014

Schlagwort(e): Superfluidity and superconductivity

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Disentangling defect-induced ferromagnetism in SiC (2014)

Yutian Wang, Lin Li, Slawomir Prucnal, Xuliang Chen, Wei Tong, Zhaorong Yang, Frans Munnik, Kay Potzger, Wolfgang Skorupa, Sibylle Gemming, Manfred Helm, and Shengqiang Zhou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Yutian Wang, Lin Li, Slawomir Prucnal, Xuliang Chen, Wei Tong, Zhaorong Yang, Frans Munnik, Kay Potzger, Wolfgang Skorupa, Sibylle Gemming, Manfred Helm, and Shengqiang Zhou We present a detailed investigation of the magnetic properties in SiC single crystals bombarded with neon ions. Through careful measuring of the magnetization of virgin and irradiated SiC, we decompose the magnetization of SiC into paramagnetic, superparamagnetic, and ferromagnetic contributions. Th... [Phys. Rev. B 89, 014417] Published Tue Jan 21, 2014

Schlagwort(e): Magnetism

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Topological magnetization jumps in a confined chiral soliton lattice (2014)

Jun-ichiro Kishine, I. G. Bostrem, A. S. Ovchinnikov, and Vl. E. Sinitsyn

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Jun-ichiro Kishine, I. G. Bostrem, A. S. Ovchinnikov, and Vl. E. Sinitsyn We demonstrate that a finite-size chiral soliton lattice formed in a chiral helimagnet with fixed boundary conditions exhibits magnetization jumps in a response to the magnetic field applied perpendicular to the chiral axis. The imposed boundary conditions lead to confinement of topological charges ... [Phys. Rev. B 89, 014419] Published Wed Jan 22, 2014

Schlagwort(e): Magnetism

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Odd-parity superconductivity in Weyl semimetals (2014)

Huazhou Wei, Sung-Po Chao, and Vivek Aji

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Huazhou Wei, Sung-Po Chao, and Vivek Aji Unconventional superconducting states of matter are realized in the presence of strong spin-orbit coupling. In particular, nondegenerate bands can support odd-parity superconductivity with rich topological content. Here we study whether this is the case for Weyl semimetals. These are systems whose l... [Phys. Rev. B 89, 014506] Published Fri Jan 10, 2014

Schlagwort(e): Superfluidity and superconductivity

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Hierarchy of exactly solvable spin-12 chains with so(N)1 critical points (2014)

Ville Lahtinen, Teresia Månsson, and Eddy Ardonne

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Ville Lahtinen, Teresia Månsson, and Eddy Ardonne We construct a hierarchy of exactly solvable spin-1/2 chains with so(N)1 critical points. Our construction is based on the framework of condensate-induced transitions between topological phases. We employ this framework to construct a Hamiltonian term that couples N transverse field Ising chains suc... [Phys. Rev. B 89, 014409] Published Fri Jan 10, 2014

Schlagwort(e): Magnetism

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Magnetocapacitance as a sensitive probe of magnetostructural changes in NiCr2O4 (2014)

Taylor D. Sparks, Moureen C. Kemei, Phillip T. Barton, Ram Seshadri, Eun-Deok Mun, and Vivien S. Zapf

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Taylor D. Sparks, Moureen C. Kemei, Phillip T. Barton, Ram Seshadri, Eun-Deok Mun, and Vivien S. Zapf The spinel NiCr2O4 is characterized using dielectric and high-magnetic-field measurements. The trends in the magnetodielectric response fall into three clear temperature regimes corresponding to known magnetic and structural transitions. Above the Néel temperature, weak magnetic field dependence of ... [Phys. Rev. B 89, 024405] Published Fri Jan 10, 2014

Schlagwort(e): Magnetism

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Vector-spin-chirality order in a dimerized frustrated spin-12 chain (2014)

Hiroshi Ueda and Shigeki Onoda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Hiroshi Ueda and Shigeki Onoda A frustrated spin-1/2 XXZ chain model comprising a ferromagnetic nearest-neighbor coupling with the bond alternation, J1(1±δ)〈0, and an antiferromagnetic second-neighbor exchange coupling J2〉0 is studied at zero and weak magnetic fields by means of density-matrix renormalization-group calculat... [Phys. Rev. B 89, 024407] Published Fri Jan 10, 2014

Schlagwort(e): Magnetism

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Superconducting proximity effect in silicene: Spin-valley-polarized Andreev reflection, nonlocal transport, and supercurrent (2014)

Jacob Linder and Takehito Yokoyama

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Jacob Linder and Takehito Yokoyama We theoretically study the superconducting proximity effect in silicene, which features massive Dirac fermions with a tunable mass (band gap), and compute the conductance across a normal-superconductor (N-S) silicene junction, the nonlocal conductance of an N-S-N junction, and the supercurrent flowi... [Phys. Rev. B 89, 020504] Published Fri Jan 10, 2014

Schlagwort(e): Superfluidity and superconductivity

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Orbital structure and magnetic ordering in stoichiometric and doped crednerite CuMnO2 (2014)

A. V. Ushakov, S. V. Streltsov, and D. I. Khomskii

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): A. V. Ushakov, S. V. Streltsov, and D. I. Khomskii The exchange interactions and magnetic structure in layered system CuMnO2 (mineral crednerite) and in nonstoichiometric system Cu1.04Mn0.96O2, with triangular layers distorted due to orbital ordering of the Mn3+ ions, are studied by ab initio band-structure calculations, which were performed within ... [Phys. Rev. B 89, 024406] Published Fri Jan 10, 2014

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Critical behavior of spin and chiral degrees of freedom in three-dimensional disordered XY models studied by the nonequilibrium aging method (2014)

F. Romá and D. Domínguez

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): F. Romá and D. Domínguez The critical behavior of the gauge-glass and the XY spin-glass models in three dimensions is studied by analyzing their nonequilibrium aging dynamics. A new numerical method, which relies on the calculation of the two-time correlation and integrated response functions, is used to determine both the ... [Phys. Rev. B 89, 024408] Published Mon Jan 13, 2014

Schlagwort(e): Magnetism

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Magnetism of iron oxide based core-shell nanoparticles from interface mixing with enhanced spin-orbit coupling (2014)

E. Skoropata, R. D. Desautels, C.-C. Chi, H. Ouyang, J. W. Freeland, and J. van Lierop

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): E. Skoropata, R. D. Desautels, C.-C. Chi, H. Ouyang, J. W. Freeland, and J. van Lierop We show that the magnetism of core-shell nanoparticles (made of maghemite, γ-Fe2O3, cores and transition-metal and metal-oxide shells) is altered substantially by the interface, which is a doped iron-oxide layer formed naturally during the seed-mediated synthesis process, a route used typically to p... [Phys. Rev. B 89, 024410] Published Mon Jan 13, 2014

Schlagwort(e): Magnetism

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Heat capacity jump at Tc and pressure derivatives of superconducting transition temperature in the Ba1−xNaxFe2As2 (0.1≤x≤0.9) series (2014)

Sergey L. Bud'ko, Duck Young Chung, Daniel Bugaris, Helmut Claus, Mercouri G. Kanatzidis, and Paul C. Canfield

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): Sergey L. Bud'ko, Duck Young Chung, Daniel Bugaris, Helmut Claus, Mercouri G. Kanatzidis, and Paul C. Canfield We present the evolution of the initial (up to ∼10 kbar) hydrostatic pressure dependencies of Tc and of the ambient pressure, and the jump in the heat capacity associated with the superconducting transition as a function of Na doping in the Ba1−xNaxFe2As2 family of iron-based superconductors. For Na... [Phys. Rev. B 89, 014510] Published Thu Jan 16, 2014

Schlagwort(e): Superfluidity and superconductivity

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Spin-density waves and the superconductivity dome in heavy electron systems with nested Fermi surfaces (2014)

P. Schlottmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): P. Schlottmann The nesting of the Fermi surfaces of an electron and a hole pocket separated by a nesting vector Q and the interaction between electrons give rise to itinerant antiferromagnetism. The order can gradually be suppressed by mismatching the nesting and a quantum critical point is obtained as the Néel te... [Phys. Rev. B 89, 014511] Published Fri Jan 17, 2014

Schlagwort(e): Superfluidity and superconductivity

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Inelastic neutron scattering studies of YFeO3 (2014)

S. E. Hahn, A. A. Podlesnyak, G. Ehlers, G. E. Granroth, R. S. Fishman, A. I. Kolesnikov, E. Pomjakushina, and K. Conder

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): S. E. Hahn, A. A. Podlesnyak, G. Ehlers, G. E. Granroth, R. S. Fishman, A. I. Kolesnikov, E. Pomjakushina, and K. Conder Spin waves in the rare-earth orthorferrite YFeO3 have been studied by inelastic neutron scattering and analyzed with a full four-sublattice model including contributions from both the weak ferromagnetic and antiferromagnetic orders. Antiferromagnetic exchange interactions of J1=−4.23±0.08 (nearest n... [Phys. Rev. B 89, 014420] Published Thu Jan 23, 2014

Schlagwort(e): Magnetism

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Spin superfluidity in coplanar multiferroics (2014)

Wei Chen and Manfred Sigrist

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): Wei Chen and Manfred Sigrist Multiferroics with coplanar magnetic order are discussed in terms of a superfluid condensate, with special emphasis on spin supercurrents created by phase gradients of the condensate and the effect of external electric fields. By drawing the analogy to a superconducting condensate, phenomena such as... [Phys. Rev. B 89, 024511] Published Thu Jan 23, 2014

Schlagwort(e): Superfluidity and superconductivity

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Cooper-pair-based photon entanglement without isolated emitters (2014)

Alex Hayat, Hae-Young Kee, Kenneth S. Burch, and Aephraim M. Steinberg

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Alex Hayat, Hae-Young Kee, Kenneth S. Burch, and Aephraim M. Steinberg We show that the recombination of Cooper pairs in semiconductors can be used as a natural source of polarization-entangled photons, making use of the inherent angular momentum entanglement in the superconducting state. Our proposal is not based on opposite spin population of discrete energy levels a... [Phys. Rev. B 89, 094508] Published Mon Mar 10, 2014

Schlagwort(e): Superfluidity and superconductivity

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Anisotropic magnetothermal transport and spin Seebeck effect (2014)

J.-E. Wegrowe, H.-J. Drouhin, and D. Lacour

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): J.-E. Wegrowe, H.-J. Drouhin, and D. Lacour The anisotropic properties of thermal transport in insulating or conducting ferromagnets are derived on the basis of the Onsager reciprocity relations applied to a magnetic system. It is shown that the angular dependence of the temperature gradient takes the same form as that of the anisotropic magn... [Phys. Rev. B 89, 094409] Published Mon Mar 10, 2014

Schlagwort(e): Magnetism

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Suppression of antiferromagnetism by pressure in CaCo2P2 (2014)

R. E. Baumbach, V. A. Sidorov, Xin Lu, N. J. Ghimire, F. Ronning, B. L. Scott, D. J. Williams, E. D. Bauer, and J. D. Thompson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): R. E. Baumbach, V. A. Sidorov, Xin Lu, N. J. Ghimire, F. Ronning, B. L. Scott, D. J. Williams, E. D. Bauer, and J. D. Thompson We report magnetization M, heat capacity C, and electrical resistivity ρ for single crystals of the itinerant electron antiferromagnet CaCo2P2 (TN ≈ 110 K). Measurements at ambient pressure reveal rich magnetic behavior, where ferromagnetic correlations are present in the paramagnetic state and a su... [Phys. Rev. B 89, 094408] Published Mon Mar 10, 2014

Schlagwort(e): Magnetism

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Magnetic flux density and the critical field in the intermediate state of type-I superconductors (2014)

V. Kozhevnikov, R. J. Wijngaarden, J. de Wit, and C. Van Haesendonck

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): V. Kozhevnikov, R. J. Wijngaarden, J. de Wit, and C. Van Haesendonck To address unsolved fundamental problems of the intermediate state (IS), the equilibrium magnetic flux structure and the critical field in a high-purity type-I superconductor (indium film) are investigated using magneto-optical imaging with a three-dimensional vector magnet and electrical transport ... [Phys. Rev. B 89, 100503] Published Mon Mar 10, 2014

Schlagwort(e): Superfluidity and superconductivity

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Tunneling spectroscopy of superconducting nanospheres (2014)

Miroslav Hopjan and Pavel Lipavský

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Miroslav Hopjan and Pavel Lipavský Energy spectra of superconducting nanospheres observed via tunneling spectroscopy are theoretically discussed. In the energy gap we find small peaks which correspond to the two-particle dynamics beyond the mean-field BCS approximation. These peaks promise to be a sensitive test of theories of superc... [Phys. Rev. B 89, 094507] Published Mon Mar 10, 2014

Schlagwort(e): Superfluidity and superconductivity

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Investigations of the superconducting states of noncentrosymmetric LaPdSi3 and LaPtSi3 (2014)

M. Smidman, A. D. Hillier, D. T. Adroja, M. R. Lees, V. K. Anand, R. P. Singh, R. I. Smith, D. M. Paul, and G. Balakrishnan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): M. Smidman, A. D. Hillier, D. T. Adroja, M. R. Lees, V. K. Anand, R. P. Singh, R. I. Smith, D. M. Paul, and G. Balakrishnan The noncentrosymmetric superconductors LaPdSi3 and LaPtSi3 have been studied with magnetization, specific-heat, resistivity, and μSR measurements. These crystallize in the tetragonal BaNiSn3 structure and superconductivity is observed at Tc=2.65(5) K for LaPdSi3 and Tc=1.52(6) K for LaPtSi3. The res... [Phys. Rev. B 89, 094509] Published Mon Mar 10, 2014

Schlagwort(e): Superfluidity and superconductivity

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Effects of hole doping on magnetic and lattice excitations in Sr2Ir1−xRuxO4 (x=0–0.2) (2014)

A. Glamazda, W.-J. Lee, K.-Y. Choi, P. Lemmens, H. Y. Choi, N. Lee, and Y. J. Choi

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): A. Glamazda, W.-J. Lee, K.-Y. Choi, P. Lemmens, H. Y. Choi, N. Lee, and Y. J. Choi Raman scattering is employed to explore the effects of hole doping in single crystals of Sr2Ir1−xRuxO4 (x=0, 0.01, 0.03, 0.05, 0.1, and 0.2). Introducing a few percentages of holes has a strong impact on magnetic excitations and lattice dynamics. With increasing x the well structured two-magnon cont... [Phys. Rev. B 89, 104406] Published Mon Mar 10, 2014

Schlagwort(e): Magnetism

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Pressure effect on magnetism and multiferroicity in Mn2GeO4 (2014)

T. Honda, T. Aoyama, J. S. White, Th. Strässle, L. Keller, M. Kenzelmann, F. Honda, A. Miyake, K. Shimizu, Y. Wakabayashi, and T. Kimura

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): T. Honda, T. Aoyama, J. S. White, Th. Strässle, L. Keller, M. Kenzelmann, F. Honda, A. Miyake, K. Shimizu, Y. Wakabayashi, and T. Kimura The effect of high pressure exceeding 6 GPa on magnetism and multiferroicity was investigated for the olivine Mn2GeO4 that shows successive magnetic transitions at ambient pressure and a ferroelectric ground state driven by spin-spiral order. We measured heat capacity, dielectric constant, and elect... [Phys. Rev. B 89, 104405] Published Mon Mar 10, 2014

Schlagwort(e): Magnetism

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Excitations and quasi-one-dimensionality in field-induced nematic and spin density wave states (2014)

Oleg A. Starykh and Leon Balents

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Oleg A. Starykh and Leon Balents We study the excitation spectrum and dynamical response functions for several quasi-one-dimensional spin systems in magnetic fields without dipolar spin order transverse to the field. This includes both nematic phases, which harbor “hidden” breaking of spin-rotation symmetry about the field and have... [Phys. Rev. B 89, 104407] Published Mon Mar 10, 2014

Schlagwort(e): Magnetism

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Weak spin interactions in Mott insulating La2O2Fe2OSe2 (2014)

E. E. McCabe, C. Stock, E. E. Rodriguez, A. S. Wills, J. W. Taylor, and J. S. O. Evans

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): E. E. McCabe, C. Stock, E. E. Rodriguez, A. S. Wills, J. W. Taylor, and J. S. O. Evans Identifying and characterizing the parent phases of iron-based superconductors is an important step towards understanding the mechanism for their high-temperature superconductivity. We present an investigation into the magnetic interactions in the Mott insulator La2O2Fe2OSe2. This iron oxyselenide a... [Phys. Rev. B 89, 100402] Published Mon Mar 10, 2014

Schlagwort(e): Magnetism

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Chiral skyrmions in cubic helimagnet films: The role of uniaxial anisotropy (2014)

M. N. Wilson, A. B. Butenko, A. N. Bogdanov, and T. L. Monchesky

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): M. N. Wilson, A. B. Butenko, A. N. Bogdanov, and T. L. Monchesky This paper reports on magnetometry and magnetoresistance measurements of MnSi epilayers performed in out-of-plane magnetic fields. We present a theoretical analysis of the chiral modulations that arise in confined cubic helimagnets where the uniaxial anisotropy axis and magnetic field are both out-o... [Phys. Rev. B 89, 094411] Published Wed Mar 12, 2014

Schlagwort(e): Magnetism

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Electronic and magnetic properties of the interface between metal-quinoline molecules and cobalt (2014)

Andrea Droghetti, Sabine Steil, Nicolas Großmann, Norman Haag, Hongtao Zhang, Maureen Willis, William P. Gillin, Alan J. Drew, Martin Aeschlimann, Stefano Sanvito, and Mirko Cinchetti

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Andrea Droghetti, Sabine Steil, Nicolas Großmann, Norman Haag, Hongtao Zhang, Maureen Willis, William P. Gillin, Alan J. Drew, Martin Aeschlimann, Stefano Sanvito, and Mirko Cinchetti It was recently established that spin injection from a ferromagnetic metal into an organic semiconductor depends largely on the formation of hybrid interface states. Here we investigate whether the magnetic properties of the interface between cobalt and tris(8-hydroxyquinolinato)-Al(III) (Alq3), the... [Phys. Rev. B 89, 094412] Published Wed Mar 12, 2014

Schlagwort(e): Magnetism

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Role of geometrical symmetry in thermally activated processes in clusters of interacting dipolar moments (2014)

O. Hovorka, J. Barker, G. Friedman, and R. W. Chantrell

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): O. Hovorka, J. Barker, G. Friedman, and R. W. Chantrell Thermally activated magnetization decay is studied in ensembles of clusters of interacting dipolar moments by applying the master-equation formalism, as a model of thermal relaxation in systems of interacting single-domain ferromagnetic particles. Solving the associated master equation reveals a bre... [Phys. Rev. B 89, 104410] Published Wed Mar 12, 2014

Schlagwort(e): Magnetism

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Magnetic phase diagram and first-principles study of Pb3TeCo3V2O14 (2014)

M. M. Markina, B. V. Mill, E. A. Zvereva, A. V. Ushakov, S. V. Streltsov, and A. N. Vasiliev

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): M. M. Markina, B. V. Mill, E. A. Zvereva, A. V. Ushakov, S. V. Streltsov, and A. N. Vasiliev An antiferromagnetic ordering in Pb3TeCo3V2O14 takes place through formation of a short-range correlation regime with T* ∼ 10.5 K and the succession of a second-order phase transition at TN1 = 8.9 K and a first-order phase transition at TN2 = 6.3 K. An external magnetic field rapidly destroys magnet... [Phys. Rev. B 89, 104409] Published Wed Mar 12, 2014

Schlagwort(e): Magnetism

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Double magnetic resonance and spin anisotropy in Fe-based superconductors due to static and fluctuating antiferromagnetic orders (2014)

Weicheng Lv, Adriana Moreo, and Elbio Dagotto

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Weicheng Lv, Adriana Moreo, and Elbio Dagotto Motivated by recent neutron scattering experiments in Fe-based superconductors, we study how the magnetic resonance in the superconducting state is affected by the simultaneous presence of either static or fluctuating magnetic orders using the random phase approximation. We find that for the underdo... [Phys. Rev. B 89, 104510] Published Wed Mar 12, 2014

Schlagwort(e): Superfluidity and superconductivity

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Structural, magnetic, and superconducting properties of pulsed-laser-deposition-grown La1.85Sr0.15CuO4/La2/3Ca1/3MnO3 superlattices on (001)-oriented LaSrAlO4 substrates (2014)

S. Das, K. Sen, I. Marozau, M. A. Uribe-Laverde, N. Biskup, M. Varela, Y. Khaydukov, O. Soltwedel, T. Keller, M. Döbeli, C. W. Schneider, and C. Bernhard

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): S. Das, K. Sen, I. Marozau, M. A. Uribe-Laverde, N. Biskup, M. Varela, Y. Khaydukov, O. Soltwedel, T. Keller, M. Döbeli, C. W. Schneider, and C. Bernhard Epitaxial La1.85Sr0.15CuO4/La2/3Ca1/3MnO3 (LSCO/LCMO) superlattices on (001)-oriented LaSrAlO4 substrates have been grown with pulsed laser deposition technique. Their structural, magnetic, and superconducting properties have been determined with in situ reflection high-energy electron diffraction, ... [Phys. Rev. B 89, 094511] Published Wed Mar 12, 2014

Schlagwort(e): Superfluidity and superconductivity

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Dissipation signatures of the normal and superfluid phases in torsion pendulum experiments with He3 in aerogel (2014)

N. Zhelev, R. G. Bennett, E. N. Smith, J. Pollanen, W. P. Halperin, and J. M. Parpia

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): N. Zhelev, R. G. Bennett, E. N. Smith, J. Pollanen, W. P. Halperin, and J. M. Parpia We present data for the energy dissipation factor Q−1 over a broad temperature range at various pressures of a torsion pendulum setup used to study He3 confined in a 98% open silica aerogel. Values for Q−1 above Tc are temperature independent and have weak pressure dependence. Below Tc, a deliberate... [Phys. Rev. B 89, 094513] Published Thu Mar 13, 2014

Schlagwort(e): Superfluidity and superconductivity

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Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies (2014)

Peiwen Gao, Rong Yu, Liling Sun, Hangdong Wang, Zhen Wang, Qi Wu, Minghu Fang, Genfu Chen, Jing Guo, Chao Zhang, Dachun Gu, Huanfang Tian, Jianqi Li, Jing Liu, Yanchun Li, Xiaodong Li, Sheng Jiang, Ke Yang, Aiguo Li, Qimiao Si, and Zhongxian Zhao

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Peiwen Gao, Rong Yu, Liling Sun, Hangdong Wang, Zhen Wang, Qi Wu, Minghu Fang, Genfu Chen, Jing Guo, Chao Zhang, Dachun Gu, Huanfang Tian, Jianqi Li, Jing Liu, Yanchun Li, Xiaodong Li, Sheng Jiang, Ke Yang, Aiguo Li, Qimiao Si, and Zhongxian Zhao There is considerable interest in uncovering the physics of iron-based superconductivity from the alkaline iron selenides, a materials class containing an insulating phase (245 phase) and a superconducting (SC) phase. Due to the microstructural complexity of these superconductors, the role of the 24... [Phys. Rev. B 89, 094514] Published Thu Mar 13, 2014

Schlagwort(e): Superfluidity and superconductivity

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Entanglement modes and topological phase transitions in superconductors (2014)

T. P. Oliveira and P. D. Sacramento

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): T. P. Oliveira and P. D. Sacramento Topological insulators and topological superconductors display various topological phases that are characterized by different Chern numbers or by gapless edge states. In this work we show that various quantum information methods such as the von Neumann entropy, entanglement spectrum, fidelity, and f... [Phys. Rev. B 89, 094512] Published Thu Mar 13, 2014

Schlagwort(e): Superfluidity and superconductivity

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Oxygen-vacancy-induced local ferromagnetism as a driving mechanism in enhancing the magnetic response of ferrites (2014)

C. E. Rodríguez Torres, G. A. Pasquevich, P. Mendoza Zélis, F. Golmar, S. P. Heluani, Sanjeev K. Nayak, Waheed A. Adeagbo, Wolfram Hergert, Martin Hoffmann, Arthur Ernst, P. Esquinazi, and S. J. Stewart

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): C. E. Rodríguez Torres, G. A. Pasquevich, P. Mendoza Zélis, F. Golmar, S. P. Heluani, Sanjeev K. Nayak, Waheed A. Adeagbo, Wolfram Hergert, Martin Hoffmann, Arthur Ernst, P. Esquinazi, and S. J. Stewart This work probes the relevance of oxygen vacancies in the formation of local ferromagnetic coupling between Fe ions at octahedral sites in zinc ferrites. This coupling gives rise to a ferrimagnetic ordering with the Curie temperatures above room temperature in an otherwise antiferromagnetic compound... [Phys. Rev. B 89, 104411] Published Thu Mar 13, 2014

Schlagwort(e): Magnetism

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Electrical detection of internal dynamical properties of domain walls (2014)

Soraya Sangiao and Michel Viret

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Soraya Sangiao and Michel Viret We report here on the electrical detection of the ferromagnetic resonance in a notched Py stripe using the spin rectification effect. A lock-in detection technique is used to measure the rectified voltage generated when applying a radio-frequency field. The multiple peaks associated with the presenc... [Phys. Rev. B 89, 104412] Published Thu Mar 13, 2014

Schlagwort(e): Magnetism

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Unfolding the electronic structure of Ca10(Fe1−xPtxAs)10(PtnAs8) (2014)

Tom Berlijn

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Tom Berlijn The iron platinum arsenides Ca10(Fe1−xPtxAs)10(PtnAs8) are the first Fe-based superconductors with metallic spacer layers. Furthermore they display a large variation in their critical temperatures depending on the amount of Pt in their spacer layers: (n=3,4). To gain more insight into the role of th... [Phys. Rev. B 89, 104511] Published Thu Mar 13, 2014

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Low-energy magnetic excitations in the spin-orbital Mott insulator Sr2IrO4 (2014)

S. Bahr, A. Alfonsov, G. Jackeli, G. Khaliullin, A. Matsumoto, T. Takayama, H. Takagi, B. Büchner, and V. Kataev

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): S. Bahr, A. Alfonsov, G. Jackeli, G. Khaliullin, A. Matsumoto, T. Takayama, H. Takagi, B. Büchner, and V. Kataev We report a high-field electron spin resonance study in the sub-THz frequency domain of a single crystal of Sr2IrO4 that has been recently proposed as a prototypical spin-orbital Mott insulator. In the antiferromagnetically ordered state with noncollinear spin structure that occurs in this material ... [Phys. Rev. B 89, 180401] Published Thu May 01, 2014

Schlagwort(e): Magnetism

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Equal-interval splitting of quantum tunneling in single-molecule magnets with identical exchange coupling (2014)

Yan-Rong Li, Rui-Yuan Liu, Hai-Qing Liu, and Yun-Ping Wang

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Yan-Rong Li, Rui-Yuan Liu, Hai-Qing Liu, and Yun-Ping Wang The equal-interval splitting of quantum tunneling observed in simple-Ising-model systems of Ni4 (3D) and Mn3 (2D) single-molecule magnets (SMMs) is reported. The splitting is due to the identical exchange coupling in the SMMs, and is simply determined by the difference between the two numbers of the... [Phys. Rev. B 89, 184401] Published Thu May 01, 2014

Schlagwort(e): Magnetism

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Quantum fluctuations in anisotropic triangular lattices with ferromagnetic and antiferromagnetic exchange (2014)

Burkhard Schmidt and Peter Thalmeier

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Burkhard Schmidt and Peter Thalmeier The Heisenberg model on a triangular lattice is a prime example of a geometrically frustrated spin system. However most experimentally accessible compounds have spatially anisotropic exchange interactions. As a function of this anisotropy, ground states with different magnetic properties can be real... [Phys. Rev. B 89, 184402] Published Thu May 01, 2014

Schlagwort(e): Magnetism

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Voltage control of magnetic anisotropy in Fe films with quantum well states (2014)

Uwe Bauer, Marek Przybylski, and Geoffrey S. D. Beach

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-03

Beschreibung: Author(s): Uwe Bauer, Marek Przybylski, and Geoffrey S. D. Beach The influence of a gate voltage on magnetic anisotropy is investigated in a thin Fe film epitaxially grown on a Ag(1,1,10) substrate and covered by MgO. Oscillations in step-induced magnetic anisotropy due to quantum well states (QWS) confined in the Fe film are observed and shown to persist up to r... [Phys. Rev. B 89, 174402] Published Fri May 02, 2014

Schlagwort(e): Magnetism

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Magnetic properties and magnon excitations in Fe(001) films grown on Ir(001) (2014)

T.-H. Chuang, Kh. Zakeri, A. Ernst, Y. Zhang, H. J. Qin, Y. Meng, Y.-J. Chen, and J. Kirschner

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): T.-H. Chuang, Kh. Zakeri, A. Ernst, Y. Zhang, H. J. Qin, Y. Meng, Y.-J. Chen, and J. Kirschner We present a comprehensive study of magnetic properties and high wave-vector magnon excitations in epitaxial Fe(001) films grown on Ir(001) substrate. The magnetic properties are investigated by magneto-optical Kerr effect for various thicknesses of Fe film from 4 up to 27 monolayers. The magnon dis... [Phys. Rev. B 89, 174404] Published Fri May 02, 2014

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Pairing symmetry, phase diagram, and edge modes in the topological Fulde-Ferrell-Larkin-Ovchinnikov phase (2014)

Chun Fai Chan and Ming Gong

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): Chun Fai Chan and Ming Gong The realizations of spin-orbit coupling in cold atoms lead to a burst of research activities in the searching of topological matters in ultracold atom systems. Recent theoretical predictions show that topological Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluids can be realized with appropriate sp... [Phys. Rev. B 89, 174501] Published Mon May 05, 2014

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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Low-energy excitations of a one-dimensional Bose gas with weak contact repulsion (2014)

M. Pustilnik and K. A. Matveev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): M. Pustilnik and K. A. Matveev We study elementary excitations of a system of one-dimensional bosons with weak contact repulsion. We show that the Gross-Pitaevskii regime, in which the excitations are the well-known Bogoliubov quasiparticles and dark solitons, does not extend to the low-energy limit. Instead, the spectra of both ... [Phys. Rev. B 89, 100504] Published Thu Mar 20, 2014

Schlagwort(e): Superfluidity and superconductivity

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Structural and magnetic properties of CoO-Pt core-shell nanoparticles (2014)

Adriana Zeleňáková, Vladimir Zeleňák, Štefan Michalík, Jozef Kováč, and Mark W. Meisel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): Adriana Zeleňáková, Vladimir Zeleňák, Štefan Michalík, Jozef Kováč, and Mark W. Meisel Using microemulsion methods, CoO-Pt core-shell nanoparticles, with diameters of nominally 4 nm, were synthesized and characterized by high-resolution transmission electron microscopy and a suite of x-ray spectroscopies, including diffraction, absorption, absorption near-edge structure, and extended ... [Phys. Rev. B 89, 104417] Published Thu Mar 20, 2014

Schlagwort(e): Magnetism

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Nonswitchable magnetic moments in polycrystalline and (111)-epitaxial permalloy/CoO exchange-biased bilayers (2014)

S.-W. Chen, X. Lu, E. Blackburn, V. Lauter, H. Ambaye, K. T. Chan, E. E. Fullerton, A. E. Berkowitz, and S. K. Sinha

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): S.-W. Chen, X. Lu, E. Blackburn, V. Lauter, H. Ambaye, K. T. Chan, E. E. Fullerton, A. E. Berkowitz, and S. K. Sinha We have measured the interfacial magnetization depth profile in ferromagnet/antiferromagnet exchange-coupled NiFe/CoO bilayers. Both a polycrystalline and an epitaxial-(111) bilayer were examined. We find that the nonswitchable magnetization profile in the biased state is highly correlated with the ... [Phys. Rev. B 89, 094419] Published Thu Mar 20, 2014

Schlagwort(e): Magnetism

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Multiple half-quantum vortices in rotating superfluid 3He (2014)

Mikio Nakahara and Tetsuo Ohmi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): Mikio Nakahara and Tetsuo Ohmi Half-quantum vortices and ordinary vortices in a rotating thin-film superfluid 3He under a strong magnetic field are considered. It is shown that 2n+1 half-quantum vortices interpolate between n singular vortices and n+1 singular vortices as the angular velocity is changed when the external magnetic... [Phys. Rev. B 89, 104515] Published Thu Mar 20, 2014

Schlagwort(e): Superfluidity and superconductivity

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Microscopic magnetic modeling for the S=12 alternating-chain compounds Na3Cu2SbO6 and Na2Cu2TeO6 (2014)

M. Schmitt, O. Janson, S. Golbs, M. Schmidt, W. Schnelle, J. Richter, and H. Rosner

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-03

Beschreibung: Author(s): M. Schmitt, O. Janson, S. Golbs, M. Schmidt, W. Schnelle, J. Richter, and H. Rosner The spin-1/2 alternating Heisenberg chain system Na3Cu2SbO6 features two relevant exchange couplings: J1a within the structural Cu2O6 dimers and J1b between the dimers. Motivated by the controversially discussed nature of J1a, we perform extensive density-functional-theory (DFT) calculations, includ... [Phys. Rev. B 89, 174403] Published Fri May 02, 2014

Schlagwort(e): Magnetism

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High-field electron spin resonance spectroscopy of singlet-triplet transitions in the spin-dimer systems Sr3Cr2O8 and Ba3Cr2O8 (2014)

Zhe Wang, D. Kamenskyi, O. Cépas, M. Schmidt, D. L. Quintero-Castro, A. T. M. N. Islam, B. Lake, A. A. Aczel, H. A. Dabkowska, A. B. Dabkowski, G. M. Luke, Yuan Wan, A. Loidl, M. Ozerov, J. Wosnitza, S. A. Zvyagin, and J. Deisenhofer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): Zhe Wang, D. Kamenskyi, O. Cépas, M. Schmidt, D. L. Quintero-Castro, A. T. M. N. Islam, B. Lake, A. A. Aczel, H. A. Dabkowska, A. B. Dabkowski, G. M. Luke, Yuan Wan, A. Loidl, M. Ozerov, J. Wosnitza, S. A. Zvyagin, and J. Deisenhofer Magnetic excitations in the isostructural spin-dimer systems Sr3Cr2O8 and Ba3Cr2O8 are probed by means of high-field electron spin resonance at subterahertz frequencies. Three types of magnetic modes were observed. One mode is gapless and corresponds to transitions within excited states, while two o... [Phys. Rev. B 89, 174406] Published Mon May 05, 2014

Schlagwort(e): Magnetism

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Topology of the planar phase of superfluid He3 and bulk-boundary correspondence for three-dimensional topological superconductors (2014)

Yuriy Makhlin, Mikhail Silaev, and G. E. Volovik

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): Yuriy Makhlin, Mikhail Silaev, and G. E. Volovik We provide topological classification of possible phases with the symmetry of the planar phase of superfluid He3. Compared to the B phase [class DIII in classification of A. Altland and M. R. Zirnbauer, Phys. Rev. B 55, 1142 (1997)], it has an additional symmetry, which modifies the topology. We ana... [Phys. Rev. B 89, 174502] Published Mon May 05, 2014

Schlagwort(e): Superfluidity and superconductivity

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Critical scaling analysis of the itinerant ferromagnet Sr1−xCaxRuO3 (2014)

D. Fuchs, M. Wissinger, J. Schmalian, C.-L. Huang, R. Fromknecht, R. Schneider, and H. v. Löhneysen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): D. Fuchs, M. Wissinger, J. Schmalian, C.-L. Huang, R. Fromknecht, R. Schneider, and H. v. Löhneysen The critical behavior of Sr1−xCaxRuO3 was investigated by a scaling analysis based on the Arrott-Noakes equation of state. The critical exponents β, γ, and δ of the magnetic critical behavior were extracted for samples with 0 ≤x≤0.6 . The ferromagnetic system exhibits a smooth suppression of the Cur... [Phys. Rev. B 89, 174405] Published Mon May 05, 2014

Schlagwort(e): Magnetism

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