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Site dependence of the Kondo scale in CePd_{1−x} Rh_{x} due to Pd-Rh disorder (2015)

U. Stockert, S. Hartmann, M. Deppe, N. Caroca-Canales, J. G. Sereni, C. Geibel, and F. Steglich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): U. Stockert, S. Hartmann, M. Deppe, N. Caroca-Canales, J. G. Sereni, C. Geibel, and F. Steglich We present measurements of the thermopower S ( T ) on CePd 1 − x Rh x between 2 K and 300 K. For low Rh content, the system behaves as a ferromagnetic Kondo system with a Curie temperature T C of about 6 K, a Kondo scale smaller than T C , and an overall crystal electric field splitting of 210 K. As the Rh con… [Phys. Rev. B 92, 054415] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Thema: Physik

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Torsion-induced effects in magnetic nanowires (2015)

Denis D. Sheka, Volodymyr P. Kravchuk, Kostiantyn V. Yershov, and Yuri Gaididei

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Denis D. Sheka, Volodymyr P. Kravchuk, Kostiantyn V. Yershov, and Yuri Gaididei A magnetic helix wire is one of the simplest magnetic systems which manifests properties of both curvature and torsion. Possible equilibrium magnetization states in the helix wire with different anisotropy directions are studied theoretically. There exist two equilibrium states in the helix wire wit… [Phys. Rev. B 92, 054417] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Exchange bias effect in Au-Fe_{3} O_{4} dumbbell nanoparticles induced by the charge transfer from gold (2015)

Mikhail Feygenson, John C. Bauer, Zheng Gai, Carlos Marques, Meigan C. Aronson, Xiaowei Teng, Dong Su, Vesna Stanic, Volker S. Urban, Kevin A. Beyer, and Sheng Dai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Mikhail Feygenson, John C. Bauer, Zheng Gai, Carlos Marques, Meigan C. Aronson, Xiaowei Teng, Dong Su, Vesna Stanic, Volker S. Urban, Kevin A. Beyer, and Sheng Dai We have studied the origin of the exchange bias effect in the Au-Fe 3 O 4 dumbbell nanoparticles in two samples with different sizes of the Au seed nanoparticles (4.1 and 2.7 nm) and same size of Fe 3 O 4 nanoparticles (9.8 nm). The magnetization, small-angle neutron-scattering, synchrotron x-ray diffract… [Phys. Rev. B 92, 054416] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Large perpendicular magnetic anisotropy in magnetostrictive Fe_{1−x} Ga_{x} thin films (2015)

M. Barturen, J. Milano, M. Vásquez-Mansilla, C. Helman, M. A. Barral, A. M. Llois, M. Eddrief, and M. Marangolo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): M. Barturen, J. Milano, M. Vásquez-Mansilla, C. Helman, M. A. Barral, A. M. Llois, M. Eddrief, and M. Marangolo In this work we report the appearance of a large perpendicular magnetic anisotropy (PMA) in Fe 1 − x Ga x thin films grown onto ZnSe/GaAs(001). This arising anisotropy is related to the tetragonal metastable phase in as-grown samples recently reported [M. Eddrief et al. , Phys. Rev. B 84 , 161410 (2011) ].… [Phys. Rev. B 92, 054418] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Spin waves in one-dimensional bicomponent magnonic quasicrystals (2015)

J. Rychły, J. W. Kłos, M. Mruczkiewicz, and M. Krawczyk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): J. Rychły, J. W. Kłos, M. Mruczkiewicz, and M. Krawczyk We studied a finite Fibonacci sequence of Co and Py stripes aligned side by side and in direct contact with each other. Calculations based on a continuous model, including exchange and dipole interactions, were performed for structures feasible for fabrication and characterization of the main proper… [Phys. Rev. B 92, 054414] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Magnetization dynamics of coupled ferromagnetic disks (2015)

Olle Heinonen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Olle Heinonen The magnetization configuration in two stacked micron-size ferromagnetic disks can assume different equilibrium states depending on the interfacial coupling between the disks. Here I examine the magnetization dynamics in response to an out-of-plane field pulse for different equilibrium states. For a… [Phys. Rev. B 92, 054420] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Single-photon level study of microwave properties of lithium niobate at millikelvin temperatures (2015)

Maxim Goryachev, Nikita Kostylev, and Michael E. Tobar

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Maxim Goryachev, Nikita Kostylev, and Michael E. Tobar The properties of doped and natural impurities in lithium niobate single crystals are studied using the whispering gallery mode method at low temperatures as a function of magnetic field. The study reveals considerable coupling of microwave photon modes to the Fe 3 + spin ensemble in iron-doped and no… [Phys. Rev. B 92, 060406(R)] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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8

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Critical suppression of spin Seebeck effect by magnetic fields (2015)

Takashi Kikkawa, Ken-ichi Uchida, Shunsuke Daimon, Zhiyong Qiu, Yuki Shiomi, and Eiji Saitoh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Takashi Kikkawa, Ken-ichi Uchida, Shunsuke Daimon, Zhiyong Qiu, Yuki Shiomi, and Eiji Saitoh The longitudinal spin Seebeck effect (LSSE) in Pt / Y 3 Fe 5 O 12 ( YIG ) junction systems has been investigated at various magnetic fields and temperatures. We found that the LSSE voltage in a Pt/YIG-slab system is suppressed by applying high magnetic fields and this suppression is critically enhanced at low… [Phys. Rev. B 92, 064413] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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9

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Skyrmion dynamics in chiral ferromagnets (2015)

Stavros Komineas and Nikos Papanicolaou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Stavros Komineas and Nikos Papanicolaou We study the dynamics of skyrmions in Dzyaloshinskii-Moriya materials with easy-axis anisotropy. An important link between topology and dynamics is established through the construction of unambiguous conservation laws obtained earlier in connection with magnetic bubbles and vortices. In particular, … [Phys. Rev. B 92, 064412] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Boosting domain wall propagation by notches (2015)

H. Y. Yuan and X. R. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): H. Y. Yuan and X. R. Wang We report a counterintuitive finding that notches in an otherwise homogeneous magnetic nanowire can boost current-induced domain wall (DW) propagation. DW motion in notch-modulated wires can be classified into three phases: (1) A DW is pinned around a notch when the current density is below the depi… [Phys. Rev. B 92, 054419] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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11

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Suppression of the impurity-induced local magnetism by the opening of a spin pseudogap in Ni-doped Sr_{2} CuO_{3} (2015)

Yannic Utz, Franziska Hammerath, Satoshi Nishimoto, Christian Hess, Neela Sekhar Beesetty, Romuald Saint-Martin, Alexandre Revcolevschi, Bernd Büchner, and Hans-Joachim Grafe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Yannic Utz, Franziska Hammerath, Satoshi Nishimoto, Christian Hess, Neela Sekhar Beesetty, Romuald Saint-Martin, Alexandre Revcolevschi, Bernd Büchner, and Hans-Joachim Grafe The S = 1 / 2 antiferromagnetic Heisenberg spin chain compound Sr 2 CuO 3 doped with 1 % and 2 % of Ni impurities has been studied by means of Cu 63 nuclear magnetic resonance. A strong decrease of the spin-lattice relaxation rate T 1 − 1 at low temperatures points toward a spin gap, while a stretching exponent … [Phys. Rev. B 92, 060405(R)] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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12

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Josephson instantons and Josephson monopoles in a non-Abelian Josephson junction (2015)

Muneto Nitta

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Muneto Nitta The non-Abelian Josephson junction is a junction of non-Abelian color superconductors sandwiching an insulator, or a non-Abelian domain wall if flexible, whose low-energy dynamics is described by a U ( N ) principal chiral model with the conventional pion mass. A non-Abelian Josephson vortex is a non-A… [Phys. Rev. D 92, 045010] Published Mon Aug 10, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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13

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Quark-gluon vertex from the Landau gauge Curci-Ferrari model (2015)

Marcela Peláez, Matthieu Tissier, and Nicolás Wschebor

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Marcela Peláez, Matthieu Tissier, and Nicolás Wschebor We investigate the quark-gluon three-point correlation function within a one-loop computation performed in the Curci-Ferrari massive extension of the Faddeev-Popov gauge-fixed action. The mass term is used as a minimal way for taking into account the influence of the Gribov ambiguity. Our results, w… [Phys. Rev. D 92, 045012] Published Tue Aug 11, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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14

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Some properties of U(1) gauged Q-balls (2015)

I. E. Gulamov, E. Ya. Nugaev, A. G. Panin, and M. N. Smolyakov

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): I. E. Gulamov, E. Ya. Nugaev, A. G. Panin, and M. N. Smolyakov In this paper we examine the properties of U ( 1 ) gauged Q -balls in two models with different scalar field potentials. The obtained results demonstrate that in the general case U ( 1 ) gauged Q -balls possess properties, which differ considerably from those of Q -balls in the nongauged case with the same f… [Phys. Rev. D 92, 045011] Published Mon Aug 10, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Eternal Higgs inflation and the cosmological constant problem (2015)

Yuta Hamada, Hikaru Kawai, and Kin-ya Oda

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Yuta Hamada, Hikaru Kawai, and Kin-ya Oda We investigate the Higgs potential beyond the Planck scale in the superstring theory, under the assumption that the supersymmetry is broken at the string scale. We identify the Higgs field as a massless state of the string, which is indicated by the fact that the bare Higgs mass can be zero around t… [Phys. Rev. D 92, 045009] Published Tue Aug 11, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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16

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Interfacial properties of LaMnO_{3} /LaNiO_{3} superlattices grown along (001) and (111) orientations (2015)

C. Piamonteze, M. Gibert, J. Heidler, J. Dreiser, S. Rusponi, H. Brune, J.-M. Triscone, F. Nolting, and U. Staub

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): C. Piamonteze, M. Gibert, J. Heidler, J. Dreiser, S. Rusponi, H. Brune, J.-M. Triscone, F. Nolting, and U. Staub We have employed x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD) at the Ni and Mn L 3 , 2 edges in LaMnO 3 / LaNiO 3 superlattices grown along (001) and (111) orientations. Our results show a significant XMCD signal and thus the presence of magnetic moments localized on both Ni a… [Phys. Rev. B 92, 014426] Published Wed Jul 29, 2015

Schlagwort(e): Magnetism

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17

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Topological charges in 2D N=(2,2) theories and massive BPS states (2015)

Daniel S. Park

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Daniel S. Park We study how charges of global symmetries that are manifest in the ultraviolet definition of a theory are realized as topological charges in its infrared effective theory for two-dimensional theories with N = ( 2 , 2 ) supersymmetry. We focus on the charges that the states living on S 1 carry. The central … [Phys. Rev. D 92, 025044] Published Wed Jul 29, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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18

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Schwinger boson mean field perspective on emergent spins in diluted Heisenberg antiferromagnets (2015)

Shivam Ghosh, Hitesh J. Changlani, and Christopher L. Henley

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Shivam Ghosh, Hitesh J. Changlani, and Christopher L. Henley Using an adaptation of Schwinger boson mean field theory (SBMFT) for nonuniform systems, we study the nature of low-energy spin excitations on the square and Bethe lattices at their percolation threshold. The optimal SBMFT parameters are interpreted as on-site potentials and pairing amplitudes, whic… [Phys. Rev. B 92, 064401] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Dynamics of photoinduced change of magnetoanisotropy parameter in orthoferrites probed with terahertz excited coherent spin precession (2015)

Keita Yamaguchi, Takayuki Kurihara, Hiroshi Watanabe, Makoto Nakajima, and Tohru Suemoto

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Keita Yamaguchi, Takayuki Kurihara, Hiroshi Watanabe, Makoto Nakajima, and Tohru Suemoto The effects of femtosecond laser excitation on the anisotropy parameter in orthoferrites ErFe O 3 and DyFe O 3 were probed through Faraday rotation induced by coherent spin precession, which was triggered by a terahertz pulse. Through the delayed frequency shift of the precession, gradual change in the … [Phys. Rev. B 92, 064404] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Quantum pressure and chemical bonding: Influence of magnetic fields on electron localization (2015)

Jianmin Tao, Shi Liu, Fan Zheng, and Andrew M. Rappe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Jianmin Tao, Shi Liu, Fan Zheng, and Andrew M. Rappe Chemical bonding is the central concept of chemistry that has been used to explain the properties of molecules and solids as well as chemical processes. In recent years, considerable progress has been made toward a simple and yet fundamental understanding of this concept for isolated systems. Here w… [Phys. Rev. B 92, 060401(R)] Published Mon Aug 03, 2015

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Thermal conductivity in large−J two-dimensional antiferromagnets: Role of phonon scattering (2015)

A. L. Chernyshev and Wolfram Brenig

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): A. L. Chernyshev and Wolfram Brenig Motivated by the recent heat transport experiments in two-dimensional antiferromagnets, such as La 2 CuO 4 , where the exchange coupling J is larger than the Debye energy Θ D , we discuss different types of relaxation processes for magnon heat current with a particular focus on coupling to three-dimension… [Phys. Rev. B 92, 054409] Published Wed Aug 05, 2015

Schlagwort(e): Magnetism

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Potentials and the vortex solutions in the CP^{N} Skyrme-Faddeev model (2015)

Yuki Amari, Paweł Klimas, Nobuyuki Sawado, and Yuta Tamaki

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Yuki Amari, Paweł Klimas, Nobuyuki Sawado, and Yuta Tamaki The extended Skyrme–Faddeev model possesses vortex solutions in a ( 3 + 1 )-dimensional Minkowski space-time with target space C P N . They have finite energy per unit of length and contain waves propagating along the vortices with the speed of light. We introduce various types of the potentials which corr… [Phys. Rev. D 92, 045007] Published Wed Aug 05, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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23

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Fluctuation relations for spin currents (2015)

Chenjie Wang and D. E. Feldman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Chenjie Wang and D. E. Feldman The fluctuation theorem establishes general relations between transport coefficients and fluctuations in nonequilibrium systems. Recently there has been much interest in quantum fluctuation relations for electric currents. Since charge carriers also carry spin, it is important to extend the fluctuat… [Phys. Rev. B 92, 064406] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures (2015)

Arianna Casiraghi, Teresa Rincón Domínguez, Stefan Rößler, Kévin J. A. Franke, Diego López González, Sampo J. Hämäläinen, Robert Frömter, Hans Peter Oepen, and Sebastiaan van Dijken

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Arianna Casiraghi, Teresa Rincón Domínguez, Stefan Rößler, Kévin J. A. Franke, Diego López González, Sampo J. Hämäläinen, Robert Frömter, Hans Peter Oepen, and Sebastiaan van Dijken In elastically coupled multiferroic heterostructures that exhibit full domain correlations between ferroelectric and ferromagnetic subsystems, magnetic domain walls are firmly pinned on top of ferroelectric domain boundaries. In this work, we investigate the influence of pinned magnetic domain walls… [Phys. Rev. B 92, 054406] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Bloch wave function for the periodic sphaleron potential and unsuppressed baryon and lepton number violating processes (2015)

S.-H. Henry Tye and Sam S. C. Wong

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): S.-H. Henry Tye and Sam S. C. Wong For the periodic sphaleron potential in the electroweak theory, we find the one-dimensional time-independent Schrödinger equation with the Chern-Simons number as the coordinate, construct the Bloch wave function and determine the corresponding conducting (pass) band structure. We show that the baryo… [Phys. Rev. D 92, 045005] Published Wed Aug 05, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Charting class S_{k} territory (2015)

Sebastián Franco, Hirotaka Hayashi, and Angel Uranga

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Sebastián Franco, Hirotaka Hayashi, and Angel Uranga We extend the investigation of the recently introduced class S k of four-dimensional N = 1 superconformal field theories by considering a large family of quiver gauge theories within it, which we denote S k 1 . These theories admit a realization in terms of Z k orbifolds of Type IIA configurations of D4-br… [Phys. Rev. D 92, 045004] Published Wed Aug 05, 2015

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Giant forward-scattering asymmetry and anomalous tunnel Hall effect at spin-orbit-split and exchange-split interfaces (2015)

T. Huong Dang, H. Jaffrès, T. L. Hoai Nguyen, and H.-J. Drouhin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): T. Huong Dang, H. Jaffrès, T. L. Hoai Nguyen, and H.-J. Drouhin We report on theoretical investigations of scattering asymmetry vs incidence of carriers through exchange barriers and magnetic tunnel junctions made of semiconductors involving spin-orbit interaction. By an analytical 2 × 2 spin model, we show that when Dresselhaus interaction is included in the cond… [Phys. Rev. B 92, 060403(R)] Published Wed Aug 05, 2015

Schlagwort(e): Magnetism

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Intracluster interactions in butterfly {Fe_{3} LnO_{2} } molecules with the non-Kramers ions Tb(III) and Ho(III) (2015)

L. Badía-Romano, J. Rubín, F. Bartolomé, J. Bartolomé, J. Luzón, D. Prodius, C. Turta, V. Mereacre, F. Wilhelm, and A. Rogalev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): L. Badía-Romano, J. Rubín, F. Bartolomé, J. Bartolomé, J. Luzón, D. Prodius, C. Turta, V. Mereacre, F. Wilhelm, and A. Rogalev The intracluster exchange interactions within the “butterfly” [ Fe 3 Ln ( μ 3 − O ) 2 ( CCl 3 COO ) 8 ( H 2 O ) ( THF ) 3 ] molecules, where Ln(III) represents a lanthanide cation, have been determined by a combination of x-ray magnetic circular dichroism (XMCD) and vibrating sample magnetometry (VSM) along with an interacti… [Phys. Rev. B 92, 064411] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Surface-termination-dependent magnetism and strong perpendicular magnetocrystalline anisotropy of an FeRh(001) thin film (2015)

Soyoung Jekal, S. H. Rhim, S. C. Hong, Won-joon Son, and A. B. Shick

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Soyoung Jekal, S. H. Rhim, S. C. Hong, Won-joon Son, and A. B. Shick The magnetism of FeRh (001) films strongly depends on film thickness and surface terminations. While the magnetic ground state of bulk FeRh is G -type antiferromagnetism, the Rh-terminated films exhibit ferromagnetism with strong perpendicular magnetocrystalline anisotropy whose energy + 2.1 meV/□ is … [Phys. Rev. B 92, 064410] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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β-detected NMR spin relaxation in a thin film heterostructure of ferromagnetic EuO (2015)

W. A. Mac; Farlane, Q. Song, N. J. C. Ingle, K. H. Chow, M. Egilmez, I. Fan, M. D. Hossain, R. F. Kiefl, C. D. P. Levy, G. D. Morris, T. J. Parolin, M. R. Pearson, H. Saadaoui, Z. Salman, and D. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): W. A. MacFarlane, Q. Song, N. J. C. Ingle, K. H. Chow, M. Egilmez, I. Fan, M. D. Hossain, R. F. Kiefl, C. D. P. Levy, G. D. Morris, T. J. Parolin, M. R. Pearson, H. Saadaoui, Z. Salman, and D. Wang We present β -detected NMR measurements of the spin-lattice relaxation of Li + 8 implanted into an epitaxial heterostructure based on a 100 nm thick film of ferromagnetic (FM) EuO as a function of temperature through its FM transition. In the FM state, the spin-lattice relaxation rate follows the same … [Phys. Rev. B 92, 064409] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Rényi entanglement entropy of critical SU(N) spin chains (2015)

Jonathan D'Emidio, Matthew S. Block, and Ribhu K. Kaul

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Jonathan D'Emidio, Matthew S. Block, and Ribhu K. Kaul We present a study of the scaling behavior of the Rényi entanglement entropy (REE) in SU ( N ) spin chain Hamiltonians, in which all of the spins transform under the fundamental representation. These SU ( N ) spin chains are known to be quantum critical and described by a well known Wess-Zumino-Witten (WZ… [Phys. Rev. B 92, 054411] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Magnetism in tetragonal manganese-rich Heusler compounds (2015)

Lukas Wollmann, Stanislav Chadov, Jürgen Kübler, and Claudia Felser

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Lukas Wollmann, Stanislav Chadov, Jürgen Kübler, and Claudia Felser A comprehensive study of the total energy of manganese-rich Heusler compounds using density functional theory is presented. Starting from a large set of cubic parent systems, the response to tetragonal distortions is studied in detail. We single out the systems that remain cubic from those that most… [Phys. Rev. B 92, 064417] Published Tue Aug 18, 2015

Schlagwort(e): Magnetism

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Kerr black hole parameters in terms of the redshift/blueshift of photons emitted by geodesic particles (2015)

Alfredo Herrera-Aguilar and Ulises Nucamendi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): Alfredo Herrera-Aguilar and Ulises Nucamendi We are motivated by the recently reported dynamical evidence of stars with short orbital periods moving around the center of the Milky Way and the corresponding hypothesis about the existence of a supermassive black hole hosted at its center. In this paper we show how the mass and rotation parameter… [Phys. Rev. D 92, 045024] Published Thu Aug 20, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Giant ferromagnetic π−d interaction in a phthalocyanine molecule (2015)

H. Murakawa, A. Kanda, M. Ikeda, M. Matsuda, and N. Hanasaki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): H. Murakawa, A. Kanda, M. Ikeda, M. Matsuda, and N. Hanasaki We experimentally demonstrate that the ferromagnetic intramolecular π − d interaction works between an itinerant π -electron spin and a localized d -electron's magnetic moment in the iron-phthalocyanine (Pc) molecular compound. The evaluation of the hidden π − d coupling is achieved by preparing the isola… [Phys. Rev. B 92, 054429] Published Fri Aug 21, 2015

Schlagwort(e): Magnetism

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Pressure-induced commensurate phase with potential giant polarization in YMn_{2} O_{5} (2015)

M. Deutsch, T. C. Hansen, M. T. Fernandez-Diaz, A. Forget, D. Colson, F. Porcher, and I. Mirebeau

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): M. Deutsch, T. C. Hansen, M. T. Fernandez-Diaz, A. Forget, D. Colson, F. Porcher, and I. Mirebeau We have studied multiferroic YMn 2 O 5 by high-pressure neutron diffraction in a large pressure range from 0.5 to 6.3 GPa. We observe a pressure-induced commensurate (PCM) phase with a propagation vector 1 2 0 1 2 that is different from those observed at ambient pressure. It coexists with the ambient press… [Phys. Rev. B 92, 060410(R)] Published Fri Aug 21, 2015

Schlagwort(e): Magnetism

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Spin current generation and magnetic response in carbon nanotubes by the twisting phonon mode (2015)

Masato Hamada, Takehito Yokoyama, and Shuichi Murakami

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Masato Hamada, Takehito Yokoyama, and Shuichi Murakami We theoretically investigate spin current and magnetic response induced by the twisting phonon mode in carbon nanotubes via the spin-rotation coupling. An effective magnetic field due to the twisting mode induces both spin and orbital magnetizations. The induced spin and orbital magnetizations have … [Phys. Rev. B 92, 060409(R)] Published Fri Aug 21, 2015

Schlagwort(e): Magnetism

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Transmission through correlated Cu_{n} CoCu_{n} heterostructures (2015)

L. Chioncel, C. Morari, A. Östlin, W. H. Appelt, A. Droghetti, M. M. Radonjić, I. Rungger, L. Vitos, U. Eckern, and A. V. Postnikov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): L. Chioncel, C. Morari, A. Östlin, W. H. Appelt, A. Droghetti, M. M. Radonjić, I. Rungger, L. Vitos, U. Eckern, and A. V. Postnikov We propose a method to compute the transmission through correlated heterostructures by combining density functional and many-body dynamical mean field theories. The heart of this combination consists in porting the many-body self-energy from an all electron basis into a pseudopotential localized ato… [Phys. Rev. B 92, 054431] Published Mon Aug 24, 2015

Schlagwort(e): Magnetism

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Quantum radiation from a particle in an accelerated motion coupled to vacuum fluctuations (2015)

Naritaka Oshita, Kazuhiro Yamamoto, and Sen Zhang

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Naritaka Oshita, Kazuhiro Yamamoto, and Sen Zhang A particle in a uniformly accelerated motion exhibits Brownian random motions around the classical trajectory due to the coupling to the field vacuum fluctuations. Previous works show that the Brownian random motions satisfy the energy equipartition relation. This thermal property is understood as t… [Phys. Rev. D 92, 045027] Published Mon Aug 24, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Interpolating relativistic and nonrelativistic Nambu-Goldstone and Higgs modes (2015)

Michikazu Kobayashi and Muneto Nitta

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Michikazu Kobayashi and Muneto Nitta When a continuous symmetry is spontaneously broken in nonrelativistic theories, there appear Nambu-Goldstone (NG) modes, the dispersion relations of which are either linear (type I) or quadratic (type II). We give a general framework to interpolate between relativistic and nonrelativistic NG modes, … [Phys. Rev. D 92, 045028] Published Mon Aug 24, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Universal scaling for a quantum discontinuity critical point and quantum quenches (2015)

Sei Suzuki and Amit Dutta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Sei Suzuki and Amit Dutta We introduce the notion of a quantum version of a discontinuity critical point (DCP) in the context of a first-order quantum phase transition referred to as a quantum DCP (QDCP). We evaluate the critical exponents associated with such a QDCP using the appropriate scaling relations focusing mainly on… [Phys. Rev. B 92, 064419] Published Mon Aug 24, 2015

Schlagwort(e): Magnetism

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Electronic and magnetic effects of a stacking fault in cobalt nanoscale islands on the Ag(111) surface (2015)

Keiji Doi, Emi Minamitani, Shunji Yamamoto, Ryuichi Arafune, Yasuo Yoshida, Satoshi Watanabe, and Yukio Hasegawa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Keiji Doi, Emi Minamitani, Shunji Yamamoto, Ryuichi Arafune, Yasuo Yoshida, Satoshi Watanabe, and Yukio Hasegawa By utilizing spin-polarized scanning tunneling microscopy (STM) and spectroscopy, we observe the coexistence of perpendicularly and in-plane magnetized cobalt nanoscale islands on an Ag(111) surface. The magnetization direction has the relationship with the observed moiré-corrugation amplitude on th… [Phys. Rev. B 92, 064421] Published Mon Aug 24, 2015

Schlagwort(e): Magnetism

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Shape-dependent exchange bias effect in magnetic nanoparticles with core-shell morphology (2015)

V. Dimitriadis, D. Kechrakos, O. Chubykalo-Fesenko, and V. Tsiantos

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): V. Dimitriadis, D. Kechrakos, O. Chubykalo-Fesenko, and V. Tsiantos We study the low-temperature isothermal magnetic hysteresis of cubical and spherical nanoparticles with ferromagnetic-core/antiferromagnetic-shell morphology, in order to elucidate the sensitivity of the exchange bias effect to the shape of the particles and the structural imperfections at the core-… [Phys. Rev. B 92, 064420] Published Mon Aug 24, 2015

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Compact stars in a SU(3) quark-meson model (2015)

Andreas Zacchi, Rainer Stiele, and Jürgen Schaffner-Bielich

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Andreas Zacchi, Rainer Stiele, and Jürgen Schaffner-Bielich The recent observations of the massive pulsars PSR J1614-2230 and of PSR J0348+0432 with about two solar masses imply strong constraints on the properties of dense matter in the core of compact stars. Effective models of QCD aiming to describe neutron star matter can thereby be considerably constrai… [Phys. Rev. D 92, 045022] Published Wed Aug 19, 2015

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G_{2} monopoles (2015)

Ya. Shnir and G. Zhilin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): Ya. Shnir and G. Zhilin We investigate some aspects of Bogomolny-Prasad-Sommerfield monopole solutions in the Yang-Mills-Higgs theory with the exceptional gauge group G 2 spontaneously broken to U ( 1 ) × U ( 1 ) . The corresponding homotopy group is π 2 ( G 2 / U ( 1 ) × U ( 1 ) ) , and similarly to the S U ( 3 ) theory, the G 2 monopoles are classifie… [Phys. Rev. D 92, 045025] Published Thu Aug 20, 2015

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Measuring acoustic mode resonance alone as a sensitive technique to extract antiferromagnetic coupling strength (2015)

Yajun Wei, Peter Svedlindh, Mikhail Kostylev, Mojtaba Ranjbar, Randy K. Dumas, and Johan Åkerman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Yajun Wei, Peter Svedlindh, Mikhail Kostylev, Mojtaba Ranjbar, Randy K. Dumas, and Johan Åkerman We have studied static and dynamic magnetic properties of a general asymmetric trilayer system using numerical simulations. For ferromagnetic, 90 ∘ , and antiferromagnetic coupling, the magnetizations of the two magnetic layers exhibit one, two, and three phases with increasing external field, respect… [Phys. Rev. B 92, 064418] Published Mon Aug 24, 2015

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Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance (2015)

Judit Romhányi, Guido Burkard, and András Pályi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Judit Romhányi, Guido Burkard, and András Pályi We theoretically study coherent subharmonic (multiphoton) transitions of a harmonically driven spin. We consider two cases: magnetic resonance (MR) with a misaligned, i.e., nontransversal, driving field, and electrically driven spin resonance (EDSR) of an electron confined in a one-dimensional, para… [Phys. Rev. B 92, 054422] Published Tue Aug 11, 2015

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Spin-wave dynamics in permalloy/cobalt magnonic crystals in the presence of a nonmagnetic spacer (2015)

P. Malagò, L. Giovannini, R. Zivieri, P. Gruszecki, and M. Krawczyk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): P. Malagò, L. Giovannini, R. Zivieri, P. Gruszecki, and M. Krawczyk In this paper, we theoretically study the influence of a nonmagnetic spacer between ferromagnetic dots and a ferromagnetic matrix on the frequency dispersion of the spin-wave excitations in two-dimensional bicomponent magnonic crystals. By means of the dynamical matrix method we investigate structur… [Phys. Rev. B 92, 064416] Published Wed Aug 12, 2015

Schlagwort(e): Magnetism

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Direct and inverse spin-orbit torques (2015)

Frank Freimuth, Stefan Blügel, and Yuriy Mokrousov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Frank Freimuth, Stefan Blügel, and Yuriy Mokrousov The connection between the spin-orbit torque (SOT) and inverse spin-orbit torque (ISOT) in systems without inversion symmetry is studied by combining phenomenological models, diffusion theory, and density functional theory. Using this, DFT calculations on Co/Pt(111) magnetic bilayers expose the mechanisms underlying SOT and ISOT and highlight their reciprocity on the microscopic level. [Phys. Rev. B 92, 064415] Published Wed Aug 12, 2015

Schlagwort(e): Magnetism

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Gapless chiral spin liquid in a kagome Heisenberg model (2015)

Samuel Bieri, Laura Messio, Bernard Bernu, and Claire Lhuillier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Samuel Bieri, Laura Messio, Bernard Bernu, and Claire Lhuillier Motivated by recent experiments on the Heisenberg S = 1 / 2 quantum spin liquid candidate material kapellasite, we classify all possible chiral (time-reversal symmetry breaking) spin liquids with fermionic spinons on the kagome lattice. We obtain the phase diagram for the physically relevant extended He… [Phys. Rev. B 92, 060407(R)] Published Fri Aug 14, 2015

Schlagwort(e): Magnetism

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Effect of structure on the magnetic anisotropy of L1_{0} FePt nanoparticles (2015)

Alamgir Kabir, Jun Hu, Volodymyr Turkowski, Ruqian Wu, Robert Camley, and Talat S. Rahman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Alamgir Kabir, Jun Hu, Volodymyr Turkowski, Ruqian Wu, Robert Camley, and Talat S. Rahman We carry out a systematic theoretical investigation of magnetocrystalline anisotropy (MCA) of L 1 0 FePt clusters with alternating Fe and Pt planes along the (001) direction. The clusters studied contain 30–484 atoms. We calculate the structural relaxation and magnetic moment of each cluster by using … [Phys. Rev. B 92, 054424] Published Thu Aug 13, 2015

Schlagwort(e): Magnetism

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Search for anisotropic Lorentz invariance violation with γ-rays (2015)

Fabian Kislat and Henric Krawczynski

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Fabian Kislat and Henric Krawczynski While Lorentz invariance, the fundamental symmetry of Einstein’s theory of general relativity, has been tested to a great level of detail, grand unified theories that combine gravity with the other three fundamental forces may result in a violation of Lorentz symmetry at the Planck scale. These ener… [Phys. Rev. D 92, 045016] Published Fri Aug 14, 2015

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Entanglement entropy in ’t Hooft model (2015)

Mikhail Goykhman

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Mikhail Goykhman We use the replica trick approach to calculate, in the large- N limit, the entanglement c -function in two-dimensional quantum chromodynamics with the gauge group U ( N ) and quark in the fundamental representation (’t Hooft model). We show explicitly that the result is equal to a sum (with certain numer… [Phys. Rev. D 92, 025048] Published Wed Jul 29, 2015

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Higgs sector extension of the neutrino minimal standard model with thermal freeze-in production mechanism (2015)

Hiroki Matsui and Mihoko Nojiri

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Hiroki Matsui and Mihoko Nojiri The neutrino minimal standard model ( ν MSM ) is the minimum extension of the standard model. In this model, the Dodelson-Widrow mechanism (DW) produces keV sterile neutrino dark matter (DM) and the degenerate GeV heavy Majorana neutrinos lead to leptogenesis. However, the DW mechanism has been ruled o… [Phys. Rev. D 92, 025045] Published Wed Jul 29, 2015

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Casimir effect for a stack of conductive planes (2015)

Nail Khusnutdinov, Rashid Kashapov, and Lilia M. Woods

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Nail Khusnutdinov, Rashid Kashapov, and Lilia M. Woods The Casimir interaction in a stack of equally spaced infinitely thin layers is investigated within the zero-frequency mode summation method. The response properties are considered to be described by a constant conductivity or by a Drude-Lorentz model with a finite set of oscillators consistent with … [Phys. Rev. D 92, 045002] Published Mon Aug 03, 2015

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Magnetization of a quantum spin system induced by a linear polarized laser (2015)

A. A. Zvyagin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): A. A. Zvyagin It is shown that a linear polarized laser can cause magnetization of a spin system with magnetic anisotropy, the distinguished axis of which is perpendicular to the polarization of the laser field. In the dynamical regime the magnetization oscillates around the nonzero value determined by the parame… [Phys. Rev. B 92, 054405] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Relative strength of thermal and electrical spin currents in a ferromagnetic tunnel contact on a semiconductor (2015)

K.-R. Jeon, H. Saito, S. Yuasa, and R. Jansen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): K.-R. Jeon, H. Saito, S. Yuasa, and R. Jansen The relative magnitude of electrical and thermal spin currents is investigated for a ferromagnetic tunnel contact on a semiconductor. A direct quantitative comparison is made by simultaneously generating electrical and thermal spin currents of opposite sign and determining the compensation point at … [Phys. Rev. B 92, 054403] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Observation of pure inverse spin Hall effect in ferromagnetic metals via ferromagnetic/antiferromagnetic exchange-bias structures (2015)

H. Wu, C. H. Wan, Z. H. Yuan, X. Zhang, J. Jiang, Q. T. Zhang, Z. C. Wen, and X. F. Han

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): H. Wu, C. H. Wan, Z. H. Yuan, X. Zhang, J. Jiang, Q. T. Zhang, Z. C. Wen, and X. F. Han We report that the spin current generated by the spin Seebeck effect (SSE) in yttrium iron garnet (YIG) can be detected by a ferromagnetic metal (NiFe). By using the ferromagnetic/antiferromagnetic (FM/AFM) exchange bias structure (NiFe/IrMn), the inverse spin Hall effect (ISHE) and planar Nernst ef… [Phys. Rev. B 92, 054404] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Geometric constructions of two-dimensional (0,2) SUSY theories (2015)

Radu Tatar

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Radu Tatar We consider the field theories on multiple stacks of D5-branes wrapped on four cycles of resolved/deformed conifold geometries fibered over a two-torus. The central charges of the D5-branes are slightly misaligned when the branes are wrapped on various rigid holomorphic two-cycles or when they have … [Phys. Rev. D 92, 045006] Published Wed Aug 05, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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String theories as the adiabatic limit of Yang-Mills theory (2015)

Alexander D. Popov

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Alexander D. Popov We consider Yang-Mills theory with a matrix gauge group G on a direct product manifold M = Σ 2 × H 2 , where Σ 2 is a two-dimensional Lorentzian manifold and H 2 is a two-dimensional open disc with the boundary S 1 = ∂ H 2 . The Euler-Lagrange equations for the metric on Σ 2 yield constraint equations for the Yang-… [Phys. Rev. D 92, 045003] Published Tue Aug 04, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Spin dynamics in pressure-induced magnetically ordered phases in (C_{4} H_{12} N_{2} )Cu_{2} Cl_{6} (2015)

G. Perren, J. S. Möller, D. Hüvonen, A. A. Podlesnyak, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): G. Perren, J. S. Möller, D. Hüvonen, A. A. Podlesnyak, and A. Zheludev Organic molecular magnets like piperazinium hexachlorodicuprate (PHCC) have attracted interest due to their sensitivity to pressure which presents possibilities for pressure-induced quantum phase transitions. Previous neutron and muon studies of PHCC gave differing indications of how the spin gap in this material varied with applied pressure. The authors of this work have resolved this discrepancy by further neutron scattering results showing that the spin gap has dissipated completely by 9 kbar, in agreement with the previous muon data. The authors also present a model in which the results are explained by the weakening of a single exchange pathway. [Phys. Rev. B 92, 054413] Published Fri Aug 07, 2015

Schlagwort(e): Magnetism

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Geometrical effects in orbital magnetic susceptibility (2015)

Yang Gao, Shengyuan A. Yang, and Qian Niu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Yang Gao, Shengyuan A. Yang, and Qian Niu Within the wave-packet semiclassical approach, the Bloch electron energy is derived to second order in the magnetic field and classified into gauge-invariant terms with clear physical meaning, yielding a fresh understanding of the complex behavior of orbital magnetic susceptibility. The Berry curvat... [Phys. Rev. B 91, 214405] Published Wed Jun 03, 2015

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Stimulated thermalization of a parametrically driven magnon gas as a prerequisite for Bose-Einstein magnon condensation (2015)

P. Clausen, D. A. Bozhko, V. I. Vasyuchka, B. Hillebrands, G. A. Melkov, and A. A. Serga

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): P. Clausen, D. A. Bozhko, V. I. Vasyuchka, B. Hillebrands, G. A. Melkov, and A. A. Serga Thermalization of a parametrically driven magnon gas leading to the formation of a Bose-Einstein condensate at the bottom of a spin-wave spectrum was studied by time- and wave-vector-resolved Brillouin light scattering spectroscopy. It has been found that the condensation is preceded by the conversi... [Phys. Rev. B 91, 220402(R)] Published Wed Jun 03, 2015

Schlagwort(e): Magnetism

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Direct observation of noncollinear order of Co and Mn moments in multiferroic Mn_{0.85}Co_{0.15}WO_{4} (2015)

J. Herrero-Martín, A. N. Dobrynin, C. Mazzoli, P. Steadman, P. Bencok, R. Fan, A. A. Mukhin, V. Skumryev, and J. L. García-Muñoz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): J. Herrero-Martín, A. N. Dobrynin, C. Mazzoli, P. Steadman, P. Bencok, R. Fan, A. A. Mukhin, V. Skumryev, and J. L. García-Muñoz Doping M n 1 − x C o x W O 4 with Co produces a rich magnetic phase diagram with a large number of ferroelectric phases. We present resonant x-ray magnetic scattering experiments in the known collinear AF4 phase of multiferroic M n 0.85 C o 0.15 W O 4 showing that Mn and Co spins point to different directions despite... [Phys. Rev. B 91, 220403(R)] Published Wed Jun 03, 2015

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Quasi-two-dimensional spin and phonon excitations in La_{1.965}Ba_{0.035}CuO_{4} (2015)

J. J. Wagman, D. Parshall, M. B. Stone, A. T. Savici, Y. Zhao, H. A. Dabkowska, and B. D. Gaulin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): J. J. Wagman, D. Parshall, M. B. Stone, A. T. Savici, Y. Zhao, H. A. Dabkowska, and B. D. Gaulin We present time-of-flight inelastic neutron scattering measurements of La 1.965 Ba 0.035 CuO 4 (LBCO), a lightly doped member of the high temperature superconducting La-based cuprate family. By using time-of-flight neutron instrumentation coupled with single crystal sample rotation we obtain a four-dimen... [Phys. Rev. B 91, 224404] Published Wed Jun 03, 2015

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Magnetic spin-flop transition and interlayer spin-wave dispersion in PrCaFeO_{4} revealed by neutron diffraction and inelastic neutron scattering (2015)

N. Qureshi, M. Valldor, L. Weber, A. Senyshyn, Y. Sidis, and M. Braden

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): N. Qureshi, M. Valldor, L. Weber, A. Senyshyn, Y. Sidis, and M. Braden We present a comprehensive study on PrCaFeO 4 using macroscopic methods, neutron and x-ray diffraction, as well as inelastic neutron scattering. One polycrystalline and two single-crystal samples were investigated exhibiting structural phase transitions from a high-temperature tetragonal phase to an ... [Phys. Rev. B 91, 224402] Published Tue Jun 02, 2015

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Magnetic phase diagram of the coupled triangular spin tubes for CsCrF_{4} (2015)

Kouichi Seki and Kouichi Okunishi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Kouichi Seki and Kouichi Okunishi Using Monte Carlo simulations, we explore the magnetic phase diagram of triangular spin tubes coupled with a ferromagnetic intertube interaction for CsCrF 4 . The planar structure of the coupled tubes is topologically equivalent to the kagome-triangular lattice, which induces nontrivial frustration ef... [Phys. Rev. B 91, 224403] Published Tue Jun 02, 2015

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Power-counting and renormalizability in Lifshitz scalar theory (2015)

Toshiaki Fujimori, Takeo Inami, Keisuke Izumi, and Tomotaka Kitamura

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Toshiaki Fujimori, Takeo Inami, Keisuke Izumi, and Tomotaka Kitamura We study the renormalizability in theories of a self-interacting Lifshitz scalar field. We show that although the statement of power-counting is true at one-loop order, in generic cases where the scalar field is dimensionless, an infinite number of counterterms are involved in the renormalization pr... [Phys. Rev. D 91, 125007] Published Thu Jun 04, 2015

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Conserved charges in timelike warped AdS_{3} spaces (2015)

L. Donnay, J. J. Fernández-Melgarejo, G. Giribet, A. Goya, and E. Lavia

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): L. Donnay, J. J. Fernández-Melgarejo, G. Giribet, A. Goya, and E. Lavia We consider the timelike version of warped anti–de Sitter space (WAdS), which corresponds to the three-dimensional section of the Gödel solution of four-dimensional cosmological Einstein equations. This geometry presents closed timelike curves (CTCs), which are inherited from its four-dimensional em... [Phys. Rev. D 91, 125006] Published Wed Jun 03, 2015

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Inverse spin Hall effect in Cr: Independence of antiferromagnetic ordering (2015)

D. Qu, S. Y. Huang, and C. L. Chien

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): D. Qu, S. Y. Huang, and C. L. Chien Chromium is a 3 d spin-density wave antiferromagnetic (AF) metal with a Néel temperature of 311 K. By using the thermal spin injection method, we have observed a large inverse spin Hall voltage in Cr. With a negligible magnetic proximity effect and a large spin Hall angle, Cr is an intrinsic pure spi… [Phys. Rev. B 92, 020418(R)] Published Wed Jul 29, 2015

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Thickness-dependent magnetic properties and strain-induced orbital magnetic moment in SrRuO_{3} thin films (2015)

K. Ishigami, K. Yoshimatsu, D. Toyota, M. Takizawa, T. Yoshida, G. Shibata, T. Harano, Y. Takahashi, T. Kadono, V. K. Verma, V. R. Singh, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, T. Koide, M. Oshima, H. Kumigashira, and A. Fujimori

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): K. Ishigami, K. Yoshimatsu, D. Toyota, M. Takizawa, T. Yoshida, G. Shibata, T. Harano, Y. Takahashi, T. Kadono, V. K. Verma, V. R. Singh, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, T. Koide, M. Oshima, H. Kumigashira, and A. Fujimori Thin films of the ferromagnetic metal SrRuO 3 (SRO) show a varying easy magnetization axis depending on the epitaxial strain, and undergo a metal-to-insulator transition with decreasing film thickness. We have investigated the magnetic properties of SRO thin films with varying thicknesses fabricated … [Phys. Rev. B 92, 064402] Published Mon Aug 03, 2015

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Ultrafast magnetization dynamics: Microscopic electronic configurations and ultrafast spectroscopy (2015)

I. L. M. Locht, I. Di Marco, S. Garnerone, A. Delin, and M. Battiato

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): I. L. M. Locht, I. Di Marco, S. Garnerone, A. Delin, and M. Battiato We provide an approach for the identification of the electronic and magnetic configurations of ferromagnetic Fe after an ultrafast decrease or increase of the magnetization. The model is based on the well-grounded assumption that, after an ultrafast variation of the magnetization, the system achieve… [Phys. Rev. B 92, 064403] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Thermal vector potential theory of magnon-driven magnetization dynamics (2015)

Gen Tatara

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Gen Tatara Thermal vector potential formulation is applied to study the thermal dynamics of magnetic structures for insulating ferromagnets. By separating the variables of the magnetic structure and the magnons, the equation of motion for the structure, including spin-transfer effect because of thermal magnons… [Phys. Rev. B 92, 064405] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Axially and radially quantized spin waves in thick permalloy nanodots (2015)

X. Zhou, D. Kumar, I. S. Maksymov, M. Kostylev, and A. O. Adeyeye

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): X. Zhou, D. Kumar, I. S. Maksymov, M. Kostylev, and A. O. Adeyeye We have investigated the spin wave modes in perpendicularly magnetized permalloy nanodots as a function of film thickness using field modulated perpendicular ferromagnetic resonance spectroscopy. We observed mode intensity inversion with an increase in dot thickness. In thicker dots, one ellusive an… [Phys. Rev. B 92, 054401] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Moduli stabilization to a natural MSSM with gravitino dark matter and inflation (2015)

Hajime Otsuka

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Hajime Otsuka We propose the gravitino dark matter in the gravity mediated supersymmetry breaking scenario. The mass hierarchies between the gravitino and other superparticles can be achieved by the nontrivial Kähler metric of the supersymmetry breaking field. As a concrete model, we consider the five-dimensional… [Phys. Rev. D 92, 045001] Published Mon Aug 03, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Ferrimagnetic resonance and magnetoelastic excitations in magnetoelectric hexaferrites (2015)

Carmine Vittoria

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Carmine Vittoria Static field properties of magnetoelectric hexaferrites have been explored extensively in the past five years. In this paper, dynamic properties of magnetoelectric hexaferrites are being explored. In particular, effects of the linear magnetoelectric coupling ( α ) on ferrimagnetic resonance (FMR) and … [Phys. Rev. B 92, 064407] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Accurate calculation of the transverse anisotropy of a magnetic domain wall in perpendicularly magnetized multilayers (2015)

Felix Büttner, Benjamin Krüger, Stefan Eisebitt, and Mathias Kläui

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Felix Büttner, Benjamin Krüger, Stefan Eisebitt, and Mathias Kläui Bloch domain walls are the most common type of transition between two out-of-plane magnetized domains (one magnetized upwards, one downwards) in films with perpendicular magnetic anisotropy. The rotation of the spins of such domain walls in the plane of the film requires energy, which is described b… [Phys. Rev. B 92, 054408] Published Wed Aug 05, 2015

Schlagwort(e): Magnetism

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Magnetic model in multiferroic NdFe_{3} (BO_{3} )_{4} investigated by inelastic neutron scattering (2015)

S. Hayashida, M. Soda, S. Itoh, T. Yokoo, K. Ohgushi, D. Kawana, H. M. Rønnow, and T. Masuda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): S. Hayashida, M. Soda, S. Itoh, T. Yokoo, K. Ohgushi, D. Kawana, H. M. Rønnow, and T. Masuda We performed inelastic neutron scattering measurements on single crystals of NdFe 3 ( BO 3 11 ) 4 to explore the magnetic excitations, to establish the underlying Hamiltonian, and to reveal the detailed nature of hybridization between the 4 f and 3 d magnetism. The observed spectra exhibiting a couple of key… [Phys. Rev. B 92, 054402] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Magnetic monopole—domain wall collisions (2015)

Micah Brush, Levon Pogosian, and Tanmay Vachaspati

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Micah Brush, Levon Pogosian, and Tanmay Vachaspati Interactions of different types of topological defects can play an important role in the aftermath of a phase transition. We study interactions of fundamental magnetic monopoles and stable domain walls in a grand unified theory in which SU ( 5 ) × Z 2 symmetry is spontaneously broken to SU ( 3 ) × SU ( 2 ) × U ( 1 ) / Z … [Phys. Rev. D 92, 045008] Published Wed Aug 05, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Multiscale modeling of ultrafast element-specific magnetization dynamics of ferromagnetic alloys (2015)

D. Hinzke, U. Atxitia, K. Carva, P. Nieves, O. Chubykalo-Fesenko, P. M. Oppeneer, and U. Nowak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): D. Hinzke, U. Atxitia, K. Carva, P. Nieves, O. Chubykalo-Fesenko, P. M. Oppeneer, and U. Nowak A hierarchical multiscale approach to model the magnetization dynamics of ferromagnetic random alloys is presented. First-principles calculations of the Heisenberg exchange integrals are linked to atomistic spin models based upon the stochastic Landau-Lifshitz-Gilbert (LLG) equation to calculate tem… [Phys. Rev. B 92, 054412] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Topological orders with global gauge anomalies (2015)

Yi-Zhuang You and Cenke Xu

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Yi-Zhuang You and Cenke Xu By definition, the physics of the d -dimensional (dim) boundary of a ( d + 1 ) -dim symmetry protected topological (SPT) state cannot be realized as itself on a d -dim lattice. If the symmetry of the system is unitary, then a formal way to determine whether a d -dim theory must be a boundary or not, is to c… [Phys. Rev. B 92, 054410] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Neutron-scattering-based evidence for interacting magnetic excitons in LaCoO_{3} (2015)

S. El-Khatib, D. Phelan, J. G. Barker, H. Zheng, J. F. Mitchell, and C. Leighton

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): S. El-Khatib, D. Phelan, J. G. Barker, H. Zheng, J. F. Mitchell, and C. Leighton For several decades LaCoO 3 attracted interest due the unconventional thermally-driven spin-state crossover from a nonmagnetic to paramagnetic state. More recently, it was realized that the “nonmagnetic” ground state harbors some form of magnetism that is likely due to local magnetic entities forming at oxygen vacancies. Such entities dubbed “magnetic excitons” were predicted in 1996, with some evidence for their existence emerging around 2005 from muon spin relaxation. In this Rapid Communication the authors provide the first scattering-based evidence for spin excitons, direct information on the size and density of the excitons, as well as their interactions. The form of the scattering is also direct proof of a bulk 3D ensemble of these excitons. [Phys. Rev. B 92, 060404(R)] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Linear antiferrodistortive-antiferromagnetic effect in multiferroics: Physical manifestations (2015)

Anna N. Morozovska, Victoria V. Khist, Maya D. Glinchuk, Venkatraman Gopalan, and Eugene A. Eliseev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Anna N. Morozovska, Victoria V. Khist, Maya D. Glinchuk, Venkatraman Gopalan, and Eugene A. Eliseev Using the theory of symmetry and the microscopic model we predict the possibility of a linear antiferrodistortive-antiferromagnetic effect in the perovskites with structural antiferrodistortive and antiferromagnetic long-range ordering and find the necessary conditions of its occurrence. The main ph… [Phys. Rev. B 92, 054421] Published Tue Aug 11, 2015

Schlagwort(e): Magnetism

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Low dimensionalization of magnetic ordering in Sr_{2} VO_{4} by hydride ion substitution (2015)

Joonho Bang, Satoru Matsuishi, Sachiko Maki, Jun-ichi Yamaura, Masatoshi Hiraishi, Soshi Takeshita, Ichihiro Yamauchi, Kenji M. Kojima, and Hideo Hosono

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Joonho Bang, Satoru Matsuishi, Sachiko Maki, Jun-ichi Yamaura, Masatoshi Hiraishi, Soshi Takeshita, Ichihiro Yamauchi, Kenji M. Kojima, and Hideo Hosono Substitution of an oxygen anion with a hydrogen anion induced the low dimensionalization of magnetic ordering in a transition metal oxide S r 2 V O 4 . Upon increasing x up to ∼ 1 in S r 2 V O 4 − x H x , the hydride ions were ordered linearly, and the magnetic susceptibility was simultaneously suppressed. It was fo… [Phys. Rev. B 92, 064414] Published Tue Aug 11, 2015

Schlagwort(e): Magnetism

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Quantum entanglement in the one-dimensional spin-orbital SU(2)⊗XXZ model (2015)

Wen-Long You, Peter Horsch, and Andrzej M. Oleś

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Wen-Long You, Peter Horsch, and Andrzej M. Oleś We investigate the phase diagram and the spin-orbital entanglement of a one-dimensional SU ( 2 ) ⊗ XXZ model with SU(2) spin exchange and anisotropic XXZ orbital exchange interactions and negative exchange coupling constant. As a unique feature, the spin-orbital entanglement entropy in the entangled grou… [Phys. Rev. B 92, 054423] Published Wed Aug 12, 2015

Schlagwort(e): Magnetism

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Two-loop renormalization of multiflavor ϕ^{3} theory in six dimensions and the trace anomaly (2015)

Benjamín Grinstein, Andreas Stergiou, David Stone, and Ming Zhong

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Benjamín Grinstein, Andreas Stergiou, David Stone, and Ming Zhong We use the background-field method and the heat kernel to obtain all counterterms to two-loop order of conformally coupled multiflavor ϕ 3 theory in six spacetime dimensions, defined in curved spacetime and with spacetime-dependent couplings. We also include spacetime-dependent mass terms for complet… [Phys. Rev. D 92, 045013] Published Tue Aug 11, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Magnetic structure of the spin−1/2 frustrated quasi-one-dimensional antiferromagnet Cu_{3} Mo_{2} O_{9} : Appearance of a partially disordered state (2015)

Masashi Hase, Haruhiko Kuroe, Vladimir Yu. Pomjakushin, Lukas Keller, Ryo Tamura, Noriki Terada, Yoshitaka Matsushita, Andreas Dönni, and Tomoyuki Sekine

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Masashi Hase, Haruhiko Kuroe, Vladimir Yu. Pomjakushin, Lukas Keller, Ryo Tamura, Noriki Terada, Yoshitaka Matsushita, Andreas Dönni, and Tomoyuki Sekine We investigated the crystal and magnetic structures of the spin − 1 2 frustrated antiferromagnet Cu 3 Mo 2 O 9 in which the spin system consists of antiferromagnetic chains and dimers. The space group at room temperature has been reported to be orthorhombic P n m a (No. 62). We infer that the space group above… [Phys. Rev. B 92, 054425] Published Thu Aug 13, 2015

Schlagwort(e): Magnetism

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First order electroweak phase transition from (non)conformal extensions of the standard model (2015)

Francesco Sannino and Jussi Virkajärvi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Francesco Sannino and Jussi Virkajärvi We analyze and compare the finite-temperature electroweak phase transition properties of classically (non)conformal extensions of the standard model. In the classically conformal scenarios the breaking of the electroweak symmetry is generated radiatively. The models feature new scalars coupled confo… [Phys. Rev. D 92, 045015] Published Thu Aug 13, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Dimensional flow in the kappa-deformed spacetime (2015)

Anjana V. and E. Harikumar

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Anjana V. and E. Harikumar We derive the modified diffusion equations defined on kappa spacetime and, using these, investigate the change in the spectral dimension of kappa spacetime with the probe scale. These deformed diffusion equations are derived by applying Wick’s rotation to the κ -deformed Schrödinger equations obtaine… [Phys. Rev. D 92, 045014] Published Fri Aug 14, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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Tuning the magnetic anisotropy in single-layer crystal structures (2015)

E. Torun, H. Sahin, C. Bacaksiz, R. T. Senger, and F. M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-11

Beschreibung: Author(s): E. Torun, H. Sahin, C. Bacaksiz, R. T. Senger, and F. M. Peeters The effect of an applied electric field and the effect of charging are investigated on the magnetic anisotropy (MA) of various stable two-dimensional (2D) crystals such as graphene, FeCl 2 , graphone, fluorographene, and MoTe 2 using first-principles calculations. We found that the magnetocrystalline a… [Phys. Rev. B 92, 104407] Published Thu Sep 10, 2015

Schlagwort(e): Magnetism

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Tailoring the magnetodynamic properties of nanomagnets using magnetocrystalline and shape anisotropies (2015)

Vegard Flovik, Ferran Macià, Joan Manel Hernàndez, Rimantas Bručas, Maj Hanson, and Erik Wahlström

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-11

Beschreibung: Author(s): Vegard Flovik, Ferran Macià, Joan Manel Hernàndez, Rimantas Bručas, Maj Hanson, and Erik Wahlström Magnetodynamical properties of nanomagnets are affected by the demagnetizing fields created by the same nanoelements. In addition, magnetocrystalline anisotropy produces an effective field that also contributes to the spin dynamics. We show how the dimensions of magnetic elements can be used to bala… [Phys. Rev. B 92, 104406] Published Thu Sep 10, 2015

Schlagwort(e): Magnetism

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Theory of excitations and dielectric response at a spin-orbital quantum critical point (2015)

Daniel Ish and Leon Balents

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-11

Beschreibung: Author(s): Daniel Ish and Leon Balents Despite possessing a local spin-2 moment on the iron site and a Curie-Weiss temperature of 45 K, the A-site spinel FeSc 2 S 4 does not magnetically order down to 50 mK. Previous theoretical work advanced an explanation for this observation in the form of the “ J 2 − λ ” model, which places FeSc 2 S 4 close to … [Phys. Rev. B 92, 094413] Published Thu Sep 10, 2015

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Electronic and magnetic properties of GaFeO_{3} : Ab initio calculations for varying Fe/Ga ratio, inner cationic site disorder, and epitaxial strain (2015)

J. Atanelov and P. Mohn

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-12

Beschreibung: Author(s): J. Atanelov and P. Mohn In this study we present ab initio density-functional theory calculations on stoichiometric, cation-doped, and strained GaFeO 3 . We start with a detailed discussion of the origin of the antiferromagnetic (AFM) superexchange in stoichiometric GaFeO 3 and give a molecular orbital description of the exch… [Phys. Rev. B 92, 104408] Published Fri Sep 11, 2015

Schlagwort(e): Magnetism

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Magnetic proximity-enhanced Curie temperature of Cr-doped Bi_{2} Se_{3} thin films (2015)

A. A. Baker, A. I. Figueroa, K. Kummer, L. J. Collins-Mc; Intyre, T. Hesjedal, and G. van der Laan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-12

Beschreibung: Author(s): A. A. Baker, A. I. Figueroa, K. Kummer, L. J. Collins-McIntyre, T. Hesjedal, and G. van der Laan We report a study on the transition temperature T C of Cr-doped topological insulator thin films, where an increase in the ferromagnetic onset can provide a pathway towards low-power spintronics in the future. Arrott plots, measured by surface-sensitive x-ray magnetic circular dichroism at the Cr L 2 , … [Phys. Rev. B 92, 094420] Published Fri Sep 11, 2015

Schlagwort(e): Magnetism

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Curvature-induced domain wall pinning (2015)

Kostiantyn V. Yershov, Volodymyr P. Kravchuk, Denis D. Sheka, and Yuri Gaididei

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-15

Beschreibung: Author(s): Kostiantyn V. Yershov, Volodymyr P. Kravchuk, Denis D. Sheka, and Yuri Gaididei It is shown that a local bend of a nanowire is a source of pinning potential for a transversal head-to-head (tail-to-tail) domain wall. Eigenfrequency of the domain wall free oscillations at the pinning potential and the effective friction are determined as functions of the curvature and domain wall… [Phys. Rev. B 92, 104412] Published Mon Sep 14, 2015

Schlagwort(e): Magnetism

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Thema: Physik

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Symmetric tensor networks and practical simulation algorithms to sharply identify classes of quantum phases distinguishable by short-range physics (2015)

Shenghan Jiang and Ying Ran

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-15

Beschreibung: Author(s): Shenghan Jiang and Ying Ran Phases of matter are sharply defined in the thermodynamic limit. One major challenge of accurately simulating quantum phase diagrams of interacting quantum systems is due to the fact that numerical simulations usually deal with the energy density, a local property of quantum wave functions, while id… [Phys. Rev. B 92, 104414] Published Mon Sep 14, 2015

Schlagwort(e): Magnetism

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Thema: Physik

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Dynamics of the electric current in an ideal electron gas: A sound mode inside the quasiparticles (2015)

Sašo Grozdanov and Janos Polonyi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-15

Beschreibung: Author(s): Sašo Grozdanov and Janos Polonyi We study the equation of motion for the Noether current in an electron gas within the framework of the Schwinger-Keldysh closed-time-path formalism. The equation is shown to be highly nonlinear and irreversible even for a noninteracting, ideal gas of electrons at nonzero density. We truncate the lin… [Phys. Rev. D 92, 065009] Published Mon Sep 14, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

Print ISSN: 0556-2821

Digitale ISSN: 1089-4918

Thema: Physik

Publiziert von American Physical Society (APS)

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Systematic study of the exchange interactions in Gd-doped GaN containing N interstitials, O interstitials, or Ga vacancies (2015)

Alexander Thiess, Stefan Blügel, Peter H. Dederichs, Rudolf Zeller, and Walter R. L. Lambrecht

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-18

Beschreibung: Author(s): Alexander Thiess, Stefan Blügel, Peter H. Dederichs, Rudolf Zeller, and Walter R. L. Lambrecht Using large supercells models and the KKRnano multiple scattering approach, statistically meaningful information is obtained on the distribution of local densities of states, magnetic moments, and distance-dependent exchange interactions for interstitial N or O or Ga vacancies in Gd-doped GaN. The e… [Phys. Rev. B 92, 104418] Published Thu Sep 17, 2015

Schlagwort(e): Magnetism

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Simultaneous measurements of terahertz emission and magneto-optical Kerr effect for resolving ultrafast laser-induced demagnetization dynamics (2015)

T. J. Huisman, R. V. Mikhaylovskiy, A. Tsukamoto, Th. Rasing, and A. V. Kimel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-18

Beschreibung: Author(s): T. J. Huisman, R. V. Mikhaylovskiy, A. Tsukamoto, Th. Rasing, and A. V. Kimel Simultaneous detection of terahertz (THz) emission and transient magneto-optical response is employed to study ultrafast laser-induced magnetization dynamics in three different types of amorphous metallic alloys: Co, GdFeCo, and NdFeCo. A satisfactory agreement between the dynamics revealed with the… [Phys. Rev. B 92, 104419] Published Thu Sep 17, 2015

Schlagwort(e): Magnetism

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Primary ferrotoroidicity in antiferromagnets (2015)

P. Tolédano, M. Ackermann, L. Bohatý, P. Becker, T. Lorenz, N. Leo, and M. Fiebig

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-19

Beschreibung: Author(s): P. Tolédano, M. Ackermann, L. Bohatý, P. Becker, T. Lorenz, N. Leo, and M. Fiebig Antiferromagnetic ordering does not give rise to a measurable macroscopic symmetry-breaking order parameter such as the magnetization in a ferromagnet. An exception is the case of antiferromagnets with a vortexlike toroidal alignment of the magnetic moments in the unit cell because this gives rise t… [Phys. Rev. B 92, 094431] Published Fri Sep 18, 2015

Schlagwort(e): Magnetism

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Thermodynamics of asymptotically safe theories (2015)

Dirk H. Rischke and Francesco Sannino

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-19

Beschreibung: Author(s): Dirk H. Rischke and Francesco Sannino We investigate the thermodynamic properties of a novel class of gauge-Yukawa theories that have recently been shown to be completely asymptotically safe, because their short-distance behavior is determined by the presence of an interacting fixed point. Not only do all the coupling constants freeze a… [Phys. Rev. D 92, 065014] Published Fri Sep 18, 2015

Schlagwort(e): Field Theory, Formal Particle Theory

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