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Magnetic anisotropy in epitaxial Py/FeMn/Cu(001) and Py/FeMn/Ni/Cu(001) films (2013)

A. Tan, J. Li, C. A. Jenkins, E. Arenholz, A. Scholl, C. Hwang, and Z. Q. Qiu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-07

Beschreibung: Author(s): A. Tan, J. Li, C. A. Jenkins, E. Arenholz, A. Scholl, C. Hwang, and Z. Q. Qiu Py/FeMn/Cu(001) and Py/FeMn/Ni/Cu(001) films were grown and studied as a function of both the FeMn and the Ni thicknesses using rotating magneto-optic Kerr effect and x-ray magnetic circular dichroism. For Py/FeMn/Cu(001), we find that the FeMn antiferromagnetic order switches the sign of the Py fou... [Phys. Rev. B 88, 104404] Published Fri Sep 06, 2013

Schlagwort(e): Magnetism

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Quantum geometry with a nondegenerate vacuum: A toy model (2013)

Sandipan Sengupta

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): Sandipan Sengupta Motivated by a recent proposal (by Koslowski-Sahlmann) of a kinematical representation in loop quantum gravity (LQG) with a nondegenerate vacuum metric, we construct a polymer quantization of the parametrized massless scalar field theory on a Minkowskian cylinder. The diffeomorphism covariant kinema... [Phys. Rev. D 88, 064016] Published Mon Sep 09, 2013

Schlagwort(e): General relativity, gravitation

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Instability of certain bimetric and massive-gravity theories (2013)

Florian Kühnel

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-12

Beschreibung: Author(s): Florian Kühnel Stability about cosmological background solutions to the bimetric Hassan-Rosen theory is studied. The results of this analysis are presented, and it is shown that a large class of cosmological backgrounds is classically unstable. This sets serious doubts on the physical viability of the Hassan-Rosen... [Phys. Rev. D 88, 064024] Published Wed Sep 11, 2013

Schlagwort(e): General relativity, gravitation

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Advanced magnetic anisotropy determination through isothermal remanent magnetization of nanoparticles (2013)

A. Hillion, A. Tamion, F. Tournus, O. Gaier, E. Bonet, C. Albin, and V. Dupuis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): A. Hillion, A. Tamion, F. Tournus, O. Gaier, E. Bonet, C. Albin, and V. Dupuis We propose a theoretical framework enabling the simulation of isothermal remanence magnetization (IRM) curves, based on the Stoner-Wohlfarth model combined with the Néel macrospin relaxation time description. We show how low temperature IRM curves, which have many advantages compared to hysteresis l... [Phys. Rev. B 88, 094419] Published Fri Sep 13, 2013

Schlagwort(e): Magnetism

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Magnetic structure of the frustrated S=1/2 chain magnet LiCu_{2}O_{2} doped with nonmagnetic Zn (2013)

A. A. Bush, N. Büttgen, A. A. Gippius, V. N. Glazkov, W. Kraetschmer, L. A. Prozorova, L. E. Svistov, A. M. Vasiliev, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): A. A. Bush, N. Büttgen, A. A. Gippius, V. N. Glazkov, W. Kraetschmer, L. A. Prozorova, L. E. Svistov, A. M. Vasiliev, and A. Zheludev We present the results of magnetization, electron spin resonance (ESR), and nuclear magnetic resonance (NMR) measurements on single-crystal samples of the frustrated S =1/2 chain cuprate LiCu 2 O 2 doped with nonmagnetic Zn 2+ . As shown by the x-ray techniques, the crystals of Li(Cu 1− x Zn x ) 2 O 2 with x 〈0... [Phys. Rev. B 88, 104411] Published Fri Sep 13, 2013

Schlagwort(e): Magnetism

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Scalar, spinor, and photon fields under relativistic cavity motion (2013)

Nicolai Friis, Antony R. Lee, and Jorma Louko

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): Nicolai Friis, Antony R. Lee, and Jorma Louko We analyze quantized scalar, spinor, and photon fields in a mechanically rigid cavity that is accelerated in Minkowski spacetime, in a recently introduced perturbative small-acceleration formalism that allows the velocities to become relativistic, with a view to applications in relativistic quantum ... [Phys. Rev. D 88, 064028] Published Fri Sep 13, 2013

Schlagwort(e): General relativity, gravitation

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Chiral anomaly and classical negative magnetoresistance of Weyl metals (2013)

D. T. Son and B. Z. Spivak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): D. T. Son and B. Z. Spivak We consider the classical magnetoresistance of a Weyl metal in which the electron Fermi surface possesses nonzero fluxes of the Berry curvature. Such a system may exhibit large negative magnetoresistance with unusual anisotropy as a function of the angle between the electric and magnetic fields. In ... [Phys. Rev. B 88, 104412] Published Fri Sep 13, 2013

Schlagwort(e): Magnetism

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Absorption of planar massless scalar waves by Kerr black holes (2013)

Caio F. B. Macedo, Luiz C. S. Leite, Ednilton S. Oliveira, Sam R. Dolan, and Luís C. B. Crispino

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Caio F. B. Macedo, Luiz C. S. Leite, Ednilton S. Oliveira, Sam R. Dolan, and Luís C. B. Crispino We consider planar massless scalar waves impinging upon a Kerr black hole, for general angles of incidence. We compute the absorption cross section via the partial wave approach, and present a gallery of results. In the low-frequency regime, we show that the cross section approaches the horizon area... [Phys. Rev. D 88, 064033] Published Tue Sep 17, 2013

Schlagwort(e): General relativity, gravitation

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Universality and thermalization in the Unruh effect (2013)

Wilson G. Brenna, Eric G. Brown, Robert B. Mann, and Eduardo Martín-Martínez

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Wilson G. Brenna, Eric G. Brown, Robert B. Mann, and Eduardo Martín-Martínez We explore the effects of different boundary conditions and coupling schemes on the response of a particle detector undergoing uniform acceleration in optical cavities. We analyze the thermalization properties of the accelerated detector via nonperturbative calculations. We prove nonperturbatively t... [Phys. Rev. D 88, 064031] Published Tue Sep 17, 2013

Schlagwort(e): General relativity, gravitation

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Energy-resolved magnetic domain imaging in TbCo alloys by valence band photoemission magnetic circular dichroism (2013)

Pascal Melchior, Markus Rollinger, Philip Thielen, Sabine Alebrand, Ute Bierbrauer, Christian Schneider, Matthias Gottwald, Michel Hehn, Stéphane Mangin, Mirko Cinchetti, and Martin Aeschlimann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): Pascal Melchior, Markus Rollinger, Philip Thielen, Sabine Alebrand, Ute Bierbrauer, Christian Schneider, Matthias Gottwald, Michel Hehn, Stéphane Mangin, Mirko Cinchetti, and Martin Aeschlimann We report magnetic domain imaging of a terbium cobalt (TbCo) alloy thin film with a high perpendicular magnetic anisotropy in one- and two-photon photoemission electron microscopy (PEEM). Both photoemission processes deliver a clear magnetic circular dichroism (MCD) whose strength is strongly energy... [Phys. Rev. B 88, 104415] Published Wed Sep 18, 2013

Schlagwort(e): Magnetism

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Dzyaloshinskii-Moriya driven helical-butterfly structure in Ba_{3}NbFe_{3}Si_{2}O_{14} (2013)

V. Scagnoli, S. W. Huang, M. Garganourakis, R. A. de Souza, U. Staub, V. Simonet, P. Lejay, and R. Ballou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): V. Scagnoli, S. W. Huang, M. Garganourakis, R. A. de Souza, U. Staub, V. Simonet, P. Lejay, and R. Ballou We have used soft x-ray magnetic diffraction at the Fe 3+ L 2,3 edges to examine to what extent the Dzyaloshinsky-Moriya interaction in Ba 3 NbFe 3 Si 2 O 14 influences its low-temperature magnetic structure. A modulated component of the moments along the c axis is present, adding to the previously proposed ... [Phys. Rev. B 88, 104417] Published Wed Sep 18, 2013

Schlagwort(e): Magnetism

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Coherent magnon and acoustic phonon dynamics in tetragonal and rare-earth-doped BiFeO_{3} multiferroic thin films (2013)

K. I. Doig, F. Aguesse, A. K. Axelsson, N. M. Alford, S. Nawaz, V. R. Palkar, S. P. P. Jones, R. D. Johnson, R. A. Synowicki, and J. Lloyd-Hughes

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): K. I. Doig, F. Aguesse, A. K. Axelsson, N. M. Alford, S. Nawaz, V. R. Palkar, S. P. P. Jones, R. D. Johnson, R. A. Synowicki, and J. Lloyd-Hughes Coherent magnons and acoustic phonons were impulsively excited and probed in thin films of the room temperature multiferroic Bi 1− x − y Dy x La y FeO 3 using femtosecond laser pulses. The elastic moduli of rhombohedral, tetragonal, and rare-earth doped BiFeO 3 were determined from acoustic-mode frequencies in... [Phys. Rev. B 88, 094425] Published Thu Sep 19, 2013

Schlagwort(e): Magnetism

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Geodesics in the linearized multipole solution: Distinguishing black holes from naked singularities (2013)

J. L. Hernandez-Pastora, L. Herrera, and J. Ospino

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): J. L. Hernandez-Pastora, L. Herrera, and J. Ospino We analyze the behavior of the geodesic motion of test particles in the spacetime of a specific class of axially symmetric static vacuum solutions to the Einstein equations, hereafter referred to as the linearized multipole solution. We discuss its suitability to describe a quasispherical spacetime.... [Phys. Rev. D 88, 064041] Published Thu Sep 19, 2013

Schlagwort(e): General relativity, gravitation

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New synthesis of matter and gravity: A nongravitating scalar field (2013)

Inyong Cho and Hyeong-Chan Kim

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): Inyong Cho and Hyeong-Chan Kim We present a new manifestation of the nonlinearity of gravity-matter interactions. We show explicitly that there exists a nongravitating dynamical scalar field solution in Eddington-inspired Born-Infeld gravity. This kind of solution has not been found in previous literature based on general relativ... [Phys. Rev. D 88, 064038] Published Thu Sep 19, 2013

Schlagwort(e): General relativity, gravitation

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Thermodynamics, entropy, and stability of thin shells in 2+1 flat spacetimes (2013)

José P. S. Lemos and Gonçalo M. Quinta

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): José P. S. Lemos and Gonçalo M. Quinta The thermodynamic equilibrium states of a static thin ring shell in a (2+1)-dimensional flat spacetime is analyzed. Inside the ring the spacetime is flat, whereas outside it is conical flat. The first law of thermodynamics applied to the thin shell leads to a shell’s entropy, which is a function of ... [Phys. Rev. D 88, 067501] Published Thu Sep 19, 2013

Schlagwort(e): General relativity, gravitation

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Orientation dependence of the critical magnetic field for multiferroic BiFeO_{3} (2013)

Randy S. Fishman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Randy S. Fishman Multiferroic BiFeO 3 undergoes a transition from a distorted spiral phase to a G-type antiferromagnet above a critical field H c that depends on the field orientation m . We show that H c ( m ) has a maximum when oriented along a cubic diagonal parallel to the electric polarization P and a minimum in the e... [Phys. Rev. B 88, 104419] Published Fri Sep 20, 2013

Schlagwort(e): Magnetism

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Modular invariance in the gapped XYZ spin-1/2 chain (2013)

Elisa Ercolessi, Stefano Evangelisti, Fabio Franchini, and Francesco Ravanini

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Elisa Ercolessi, Stefano Evangelisti, Fabio Franchini, and Francesco Ravanini We show that the elliptic parametrization of the coupling constants of the quantum X Y Z spin chain can be analytically extended outside of their natural domain, to cover the whole phase diagram of the model, which is composed of 12 adjacent regions, related to one another by a spin rotation. This ext... [Phys. Rev. B 88, 104418] Published Fri Sep 20, 2013

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Theory of asymmetric and negative differential magnon tunneling under temperature bias: Towards a spin Seebeck diode and transistor (2013)

Jie Ren and Jian-Xin Zhu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Jie Ren and Jian-Xin Zhu We study the nonequilibrium transport for the asymmetric and negative differential magnon tunneling driven by temperature bias. We demonstrate that the many-body magnon interaction that makes the magnonic spectrum temperature-dependent is the crucial factor for the emergence of rectification and neg... [Phys. Rev. B 88, 094427] Published Mon Sep 23, 2013

Schlagwort(e): Magnetism

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Dynamical black holes: Approach to the final state (2013)

Abhay Ashtekar, Miguel Campiglia, and Samir Shah

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Abhay Ashtekar, Miguel Campiglia, and Samir Shah Since black holes can be formed through widely varying processes, the horizon structure is highly complicated in the dynamical phase. Nonetheless, as numerical simulations show, the final state appears to be universal, well described by the Kerr geometry. How are all these large and widely varying d... [Phys. Rev. D 88, 064045] Published Mon Sep 23, 2013

Schlagwort(e): General relativity, gravitation

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Visualizing spacetime curvature via gradient flows. III. The Kerr metric and the transitional values of the spin parameter (2013)

Majd Abdelqader and Kayll Lake

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Majd Abdelqader and Kayll Lake The Kerr metric is one of the most important solutions to Einstein’s field equations describing the gravitational field outside a rotating black hole. We thoroughly analyze the curvature scalar invariants to study the Kerr spacetime by examining and visualizing their covariant gradient fields. We di... [Phys. Rev. D 88, 064042] Published Mon Sep 23, 2013

Schlagwort(e): General relativity, gravitation

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Structural control of magnetic anisotropy in a strain-driven multiferroic EuTiO_{3} thin film (2013)

X. Ke, T. Birol, R. Misra, J.-H. Lee, B. J. Kirby, D. G. Schlom, C. J. Fennie, and J. W. Freeland

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): X. Ke, T. Birol, R. Misra, J.-H. Lee, B. J. Kirby, D. G. Schlom, C. J. Fennie, and J. W. Freeland Octahedral distortion plays a key role in engineering the physical properties of heterostructures composed of perovskite oxides. We observe a strong in-plane uniaxial magnetic anisotropy in a strain-enabled multiferroic EuTiO 3 thin film epitaxially grown on a (110) o DyScO 3 substrate. First-principle... [Phys. Rev. B 88, 094434] Published Thu Sep 26, 2013

Schlagwort(e): Magnetism

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Phase diagram of the spin-1 Heisenberg model with three-site interactions on the square lattice (2013)

F. Michaud and F. Mila

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): F. Michaud and F. Mila We study the spin S =1 antiferromagnetic Heisenberg model on the square lattice with, in addition to the nearest-neighbor interaction, a three-site interaction of the form ( S i · S j )( S j · S k )+H.c. This interaction appears naturally in a strong coupling expansion of the two-orbital, half-filled Hubbard mod... [Phys. Rev. B 88, 094435] Published Thu Sep 26, 2013

Schlagwort(e): Magnetism

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Nuclear magnetic resonance studies of pseudospin fluctuations in URu_{2}Si_{2} (2013)

K. R. Shirer, J. T. Haraldsen, A. P. Dioguardi, J. Crocker, N. ap; Roberts-Warren, A. C. Shockley, C.-H. Lin, D. M. Nisson, J. C. Cooley, M. Janoschek, K. Huang, N. Kanchanavatee, M. B. Maple, M. J. Graf, A. V. Balatsky, and N. J. Curro

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): K. R. Shirer, J. T. Haraldsen, A. P. Dioguardi, J. Crocker, N. apRoberts-Warren, A. C. Shockley, C.-H. Lin, D. M. Nisson, J. C. Cooley, M. Janoschek, K. Huang, N. Kanchanavatee, M. B. Maple, M. J. Graf, A. V. Balatsky, and N. J. Curro We report 29 Si nuclear magnetic resonance measurements in single crystals and aligned powders of URu 2 Si 2 in the hidden order and paramagnetic phases. The spin-lattice relaxation data reveal evidence of pseudospin fluctuations of U moments in the paramagnetic phase. We find evidence for partial suppr... [Phys. Rev. B 88, 094436] Published Thu Sep 26, 2013

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Chiral properties of hematite α-Fe_{2}O_{3} inferred from resonant Bragg diffraction using circularly polarized x rays (2013)

A. Rodríguez-Fernández, J. A. Blanco, S. W. Lovesey, V. Scagnoli, U. Staub, H. C. Walker, D. K. Shukla, and J. Strempfer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): A. Rodríguez-Fernández, J. A. Blanco, S. W. Lovesey, V. Scagnoli, U. Staub, H. C. Walker, D. K. Shukla, and J. Strempfer Chiral properties of the two phases—collinear motif (below Morin transition temperature, T M ≈250 K) and canted motif (above T M )—of magnetically ordered hematite ( α -Fe 2 O 3 ) have been identified in single-crystal resonant x-ray Bragg diffraction using circular polarized incident x rays tuned near the ir... [Phys. Rev. B 88, 094437] Published Thu Sep 26, 2013

Schlagwort(e): Magnetism

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Spin-torque switching efficiency in CoFeB-MgO based tunnel junctions (2013)

J. Z. Sun, S. L. Brown, W. Chen, E. A. Delenia, M. C. Gaidis, J. Harms, G. Hu, Xin Jiang, R. Kilaru, W. Kula, G. Lauer, L. Q. Liu, S. Murthy, J. Nowak, E. J. O’Sullivan, S. S. P. Parkin, R. P. Robertazzi, P. M. Rice, G. Sandhu, T. Topuria, and D. C. Worledge

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): J. Z. Sun, S. L. Brown, W. Chen, E. A. Delenia, M. C. Gaidis, J. Harms, G. Hu, Xin Jiang, R. Kilaru, W. Kula, G. Lauer, L. Q. Liu, S. Murthy, J. Nowak, E. J. O’Sullivan, S. S. P. Parkin, R. P. Robertazzi, P. M. Rice, G. Sandhu, T. Topuria, and D. C. Worledge It is convenient to define the spin-torque switching efficiency in nanostructured magnetic tunnel junctions as the ratio between the free-layers thermal activation barrier height E b and the threshold switching current I c 0 . Recent device exploration has led to occasional observations of spin-torque i... [Phys. Rev. B 88, 104426] Published Thu Sep 26, 2013

Schlagwort(e): Magnetism

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Searching for AdS_{3} waves and asymptotically Lifshitz black holes in R^{3} new massive gravity (2013)

Giorgos G. Anastasiou, M. R. Setare, and Elias C. Vagenas

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): Giorgos G. Anastasiou, M. R. Setare, and Elias C. Vagenas In this paper, we consider the structure of the AdS 3 vacua in R 3 expansion of new massive gravity ( R 3 -NMG). We obtain the degeneracies of the AdS 3 vacua at several points of the parametric space. Additionally, following a specific analysis we show that AdS 3 wave solutions are present. Using these wa... [Phys. Rev. D 88, 064054] Published Thu Sep 26, 2013

Schlagwort(e): General relativity, gravitation

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Analytic treatment of the charged black-hole-mirror bomb in the highly explosive regime (2013)

Shahar Hod

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): Shahar Hod A charged scalar field impinging upon a charged Reissner–Nordström black hole can be amplified as it scatters off the hole, a phenomenon known as super-radiant scattering. This scattering process in the super-radiant regime ω 〈 q Q / r + (here ω , q , Q , and r ± are the conserved frequency of the wave, th... [Phys. Rev. D 88, 064055] Published Thu Sep 26, 2013

Schlagwort(e): General relativity, gravitation

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Magnetoelectric coupling in the Haldane spin-chain system Dy_{2}BaNiO_{5} (2013)

Kiran Singh, Tathamay Basu, S. Chowki, N. Mahapotra, Kartik K. Iyer, P. L. Paulose, and E. V. Sampathkumaran

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-28

Beschreibung: Author(s): Kiran Singh, Tathamay Basu, S. Chowki, N. Mahapotra, Kartik K. Iyer, P. L. Paulose, and E. V. Sampathkumaran We report the results of various measurements, namely magnetization, complex dielectric permittivity, and electric polarization ( P ), on Dy 2 BaNiO 5 as a function of temperature ( T ) and magnetic field ( H ), apart from heat capacity ( C ), with the primary motivation of exploring the existence of magnetoel... [Phys. Rev. B 88, 094438] Published Fri Sep 27, 2013

Schlagwort(e): Magnetism

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Dynamical evolution of the electromagnetic perturbation with Weyl corrections (2013)

Songbai Chen and Jiliang Jing

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-28

Beschreibung: Author(s): Songbai Chen and Jiliang Jing We present firstly the master equation of an electromagnetic perturbation with Weyl correction in the four-dimensional black hole spacetime, which depends not only on the Weyl correction parameter, but also on the parity of the electromagnetic field. It is quite different from that of the usual elec... [Phys. Rev. D 88, 064058] Published Fri Sep 27, 2013

Schlagwort(e): General relativity, gravitation

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Null geodesics, local CFT operators, and AdS/CFT for subregions (2013)

Raphael Bousso, Ben Freivogel, Stefan Leichenauer, Vladimir Rosenhaus, and Claire Zukowski

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-28

Beschreibung: Author(s): Raphael Bousso, Ben Freivogel, Stefan Leichenauer, Vladimir Rosenhaus, and Claire Zukowski We investigate the nature of the AdS/CFT duality between a subregion of the bulk and its boundary. In global AdS/CFT in the classical G N =0 limit, the duality reduces to a boundary value problem that can be solved by restricting to one-point functions of local operators in the conformal field theory ... [Phys. Rev. D 88, 064057] Published Fri Sep 27, 2013

Schlagwort(e): General relativity, gravitation

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Rosetta stone for parametrized tests of gravity (2013)

Laura Sampson, Nicolás Yunes, and Neil Cornish

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-28

Beschreibung: Author(s): Laura Sampson, Nicolás Yunes, and Neil Cornish Several model-independent parametrizations of deviations from general relativity have been developed to test Einstein’s theory. Although these different parametrizations were developed for different gravitational observables, they ultimately all test the same underlying physics. In this paper, we de... [Phys. Rev. D 88, 064056] Published Fri Sep 27, 2013

Schlagwort(e): General relativity, gravitation

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Itinerant electronic ferromagnetism in Sr_{2}ScO_{3}CoAs with largely spaced CoAs conduction layers (2013)

Hiroto Ohta, Daisuke Noguchi, Koichiro Nabetani, and Hiroko Aruga Katori

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Hiroto Ohta, Daisuke Noguchi, Koichiro Nabetani, and Hiroko Aruga Katori We studied magnetism of Sr 2 ScO 3 CoAs, a member of the group of layered compound with CoAs conducting layers, by using successfully synthesized polycrystalline sample. As a result of magnetic and electric resistivity measurements, Sr 2 ScO 3 CoAs was revealed to be an itinerant electronic ferromagnet with... [Phys. Rev. B 88, 094441] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Magnetocrystalline anisotropy and the magnetocaloric effect in Fe_{2}P (2013)

L. Caron, M. Hudl, V. Höglin, N. H. Dung, C. P. Gomez, M. Sahlberg, E. Brück, Y. Andersson, and P. Nordblad

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): L. Caron, M. Hudl, V. Höglin, N. H. Dung, C. P. Gomez, M. Sahlberg, E. Brück, Y. Andersson, and P. Nordblad Magnetic and magnetocaloric properties of high-purity, giant magnetocaloric polycrystalline and single-crystalline Fe 2 P are investigated. Fe 2 P displays a moderate magnetic entropy change, which spans over 70 K and the presence of strong magnetization anisotropy proves this system is not fully itiner... [Phys. Rev. B 88, 094440] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Magnetic ground state of the M_{n+1}AX_{n}-phase nitride Cr_{2}GaN (2013)

Z. Liu, T. Waki, Y. Tabata, K. Yuge, H. Nakamura, and I. Watanabe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-02

Beschreibung: Author(s): Z. Liu, T. Waki, Y. Tabata, K. Yuge, H. Nakamura, and I. Watanabe Aiming to find magnetic states in the M n +1 A X n phases, we measured the magnetic susceptibility, the resistivity, and nuclear magnetic resonance of Cr 2 Ga X ( X =N and C). Zero-field and longitudinal-field muon spin relaxation experiments were also applied to Cr 2 GaN. A magnetic phase transition, most prob... [Phys. Rev. B 88, 134401] Published Tue Oct 01, 2013

Schlagwort(e): Magnetism

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Collision of shock waves in Einstein-Maxwell theory with a cosmological constant: A special solution (2013)

C. Barrabès and P. A. Hogan

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-02

Beschreibung: Author(s): C. Barrabès and P. A. Hogan Postcollision space-times of the Cartesian product form M ′ × M ′′ , where M ′ and M ′′ are two-dimensional manifolds, are known with M ′ and M ′′ having constant curvatures of equal and opposite sign (for the collision of electromagnetic shock waves) or of the same sign (for the collision of gravitational s... [Phys. Rev. D 88, 087501] Published Tue Oct 01, 2013

Schlagwort(e): General relativity, gravitation

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Searching for anisotropic gravitational-wave backgrounds using pulsar timing arrays (2013)

Stephen R. Taylor and Jonathan R. Gair

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-02

Beschreibung: Author(s): Stephen R. Taylor and Jonathan R. Gair We present the results of simulated injections testing the first Bayesian search pipeline capable of investigating the angular structure of a gravitational-wave (GW) background influencing pulsar signals. A stochastic background of GWs from the incoherent superposition of many inspiraling supermassi... [Phys. Rev. D 88, 084001] Published Tue Oct 01, 2013

Schlagwort(e): General relativity, gravitation

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Robust perpendicular exchange coupling in an ultrathin CoO/PtFe double layer: Strain and spin orientation (2013)

Anne D. Lamirand, Márcio M. Soares, Aline Y. Ramos, Hélio C. N. Tolentino, Maurizio De Santis, Julio C. Cezar, Abner de Siervo, and Matthieu Jamet

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Anne D. Lamirand, Márcio M. Soares, Aline Y. Ramos, Hélio C. N. Tolentino, Maurizio De Santis, Julio C. Cezar, Abner de Siervo, and Matthieu Jamet We report on the exchange coupling and magnetic properties of a strained ultrathin CoO/PtFe double layer with perpendicular magnetic anisotropy. The cobalt oxide growth by reactive molecular beam epitaxy on a Pt-terminated PtFe/Pt(001) surface gives rise to a hexagonal surface and a monoclinic disto... [Phys. Rev. B 88, 140401] Published Wed Oct 02, 2013

Schlagwort(e): Magnetism

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Potential for general relativity and its geometry (2013)

Gregory Gabadadze, Kurt Hinterbichler, David Pirtskhalava, and Yanwen Shang

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Gregory Gabadadze, Kurt Hinterbichler, David Pirtskhalava, and Yanwen Shang The unique ghost-free mass and nonlinear potential terms for general relativity are presented in a diffeomorphism and local Lorentz invariant vierbein formalism. This construction requires an additional two-index Stückelberg field, beyond the four scalar fields used in the metric formulation, and un... [Phys. Rev. D 88, 084003] Published Wed Oct 02, 2013

Schlagwort(e): General relativity, gravitation

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Restoring general relativity in massive bigravity theory (2013)

Eugeny Babichev and Marco Crisostomi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Eugeny Babichev and Marco Crisostomi We study static spherically symmetric solutions of massive bigravity theory, free from the Boulware-Deser ghost. We show the recovery of general relativity via the Vainshtein mechanism, in the weak limit of the physical metric. We find a single polynomial equation determining the behavior of the sol... [Phys. Rev. D 88, 084002] Published Wed Oct 02, 2013

Schlagwort(e): General relativity, gravitation

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Phase coexistence and magnetically tuneable polarization in cycloidal multiferroics (2013)

I. Fina, V. Skumryev, D. O’Flynn, G. Balakrishnan, and J. Fontcuberta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-07

Beschreibung: Author(s): I. Fina, V. Skumryev, D. O’Flynn, G. Balakrishnan, and J. Fontcuberta In some magnetic ferroelectrics the polarization P direction can be selected by a magnetic field H . Here we show that in a (Y 1− x Sm x )MnO 3 single crystal, both the direction and the magnitude of P can be controlled solely by H . We argue that this remarkable dual control arises from both the phase coex... [Phys. Rev. B 88, 100403] Published Fri Sep 06, 2013

Schlagwort(e): Magnetism

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Microwave-induced excitations in the kagome system Pr_{3}Ga_{5}SiO_{14} (2013)

Sanhita Ghosh, Saiti Datta, Haidong Zhou, Michael Hoch, Christopher R. Wiebe, Pedro Schlottmann, and Stephen Hill

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): Sanhita Ghosh, Saiti Datta, Haidong Zhou, Michael Hoch, Christopher R. Wiebe, Pedro Schlottmann, and Stephen Hill Low-energy excitations in the rare earth kagome spin system Pr 3 Ga 5 SiO 14 (PGS) have been investigated using high-field electron spin resonance (ESR) techniques. Previous work has shown that PGS does not exhibit long-range magnetic order at temperatures down to 30 mK. The present low-temperature (1.3–... [Phys. Rev. B 88, 094414] Published Tue Sep 10, 2013

Schlagwort(e): Magnetism

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Nonviolent nonlocality (2013)

Steven B. Giddings

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): Steven B. Giddings If quantum mechanics governs nature, black holes must evolve unitarily, providing a powerful constraint on the dynamics of quantum gravity. Such evolution apparently must in particular be nonlocal, when described from the usual semiclassical geometric picture, in order to transfer quantum informatio... [Phys. Rev. D 88, 064023] Published Tue Sep 10, 2013

Schlagwort(e): General relativity, gravitation

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Unified Bertotti-Robinson and Melvin spacetimes (2013)

S. Habib Mazharimousavi and M. Halilsoy

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): S. Habib Mazharimousavi and M. Halilsoy We present a solution for the Einstein-Maxwell equations which unifies both the magnetic Bertotti-Robinson and Melvin solutions as a single metric in the axially symmetric coordinates { t , ρ , z , φ }. Depending on the strength of magnetic field the spacetime manifold, unlike the cases of separate Bertotti... [Phys. Rev. D 88, 064021] Published Tue Sep 10, 2013

Schlagwort(e): General relativity, gravitation

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Spin state and orbital ordering in CuCr_{2}O_{4} investigated by NMR (2013)

Euna Jo, Byeongki Kang, Changsoo Kim, Sangil Kwon, and Soonchil Lee

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Euna Jo, Byeongki Kang, Changsoo Kim, Sangil Kwon, and Soonchil Lee 63,65 Cu and 53 Cr nuclear magnetic resonance spectra for CuCr 2 O 4 were measured at various magnetic fields and temperatures. The microscopic evidence of orbital ordering in CuCr 2 O 4 was obtained from a dipolar hyperfine field, NQR, and magnetic anisotropy analysis of the linewidth broadening of the Cu ... [Phys. Rev. B 88, 094417] Published Thu Sep 12, 2013

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Tailoring magnetic properties of metallic thin films with quantum well states and external electric fields (2013)

T. R. Dasa, P. Ruiz-Díaz, O. O. Brovko, and V. S. Stepanyuk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): T. R. Dasa, P. Ruiz-Díaz, O. O. Brovko, and V. S. Stepanyuk Thickness dependence of magnetic anisotropy energy (MAE) and spin polarization in Fe and Co multilayers on a Pt(001) substrate are investigated with ab initio techniques. As the thickness of the thin films is increased, an oscillatory behavior of the MAE of the systems is observed. For Fe multilayer... [Phys. Rev. B 88, 104409] Published Thu Sep 12, 2013

Schlagwort(e): Magnetism

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Induced magnetism versus Kondo screening in alternating Mott-metal layers (2013)

Aleksander Zujev and Pinaki Sengupta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Aleksander Zujev and Pinaki Sengupta We investigate the magnetic properties of a heterostructure comprised of alternating metallic and Mott insulating layers of fermions with varying interlayer hybridization. Results from large-scale quantum Monte Carlo simulations at half-filling show clear evidence of induced magnetism in the metalli... [Phys. Rev. B 88, 094415] Published Thu Sep 12, 2013

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Binding carriers to a nonmagnetic impurity in a two-dimensional square Ising antiferromagnet (2013)

Hadi Ebrahimnejad and Mona Berciu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Hadi Ebrahimnejad and Mona Berciu A hole in a two-dimensional Ising antiferromagnet was believed to be infinitely heavy due to the string of wrongly oriented spins it creates as it moves, which should trap it near its original location. Trugman showed that, in fact, the hole acquires a finite effective mass due to contributions from... [Phys. Rev. B 88, 104410] Published Thu Sep 12, 2013

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Effective potential and Goldstone bosons in de Sitter space (2013)

Takashi Arai

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): Takashi Arai We investigate nonperturbative infrared effects for the O ( N ) linear sigma model in de Sitter space using the two-particle irreducible effective action at the Hartree truncation level. This approximation resums the infinite series of so-called superdaisy diagrams. For the proper treatment of ultravio... [Phys. Rev. D 88, 064029] Published Fri Sep 13, 2013

Schlagwort(e): General relativity, gravitation

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Unusual temperature-dependent exchange interaction in GdFe_{2}Al_{10} in comparison with GdRu_{2}Al_{10} (2013)

M. Sera, H. Nohara, M. Nakamura, H. Tanida, T. Nishioka, and M. Matsumura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): M. Sera, H. Nohara, M. Nakamura, H. Tanida, T. Nishioka, and M. Matsumura We investigated the magnetic properties of the antiferromagnetic (AFM) compound Gd T 2 Al 10 ( T =Ru and Fe). Although GdRu 2 Al 10 could be understood well as a simple AFM compound, the exchange interaction in GdFe 2 Al 10 is found to be greatly varied with temperature. The magnitude of the AFM exchange intera... [Phys. Rev. B 88, 100404] Published Fri Sep 13, 2013

Schlagwort(e): Magnetism

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Wormholes in higher dimensional space-time: Exact solutions and their linear stability analysis (2013)

Takashi Torii and Hisa-aki Shinkai

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): Takashi Torii and Hisa-aki Shinkai We derive the simplest traversable wormhole solutions in n -dimensional general relativity, assuming static and spherically symmetric space-time with a ghost scalar field. This is the generalization of the Ellis solution (or the so-called Morris-Thorne’s traversable wormhole) into a higher dimension.... [Phys. Rev. D 88, 064027] Published Fri Sep 13, 2013

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Multiple phase transitions in CuO observed with thermal expansion (2013)

A. Rebello, Z. C. M. Winter, S. Viall, and J. J. Neumeier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): A. Rebello, Z. C. M. Winter, S. Viall, and J. J. Neumeier High-resolution thermal-expansion measurements of single-crystalline CuO (tenorite) are reported for the temperature range 5〈 T 〈350 K. The data reveal three transitions ( T N 1 = 213 K, T N 2 = 229.2 K, and T N 3 = 229.8 K), which corroborate the recently proposed magnetic phase diagram [ Villarreal, ... [Phys. Rev. B 88, 094420] Published Mon Sep 16, 2013

Schlagwort(e): Magnetism

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Influence of the magnetic material on tunneling magnetoresistance and spin-transfer torque in tunnel junctions: Ab initio studies (2013)

Christian Franz, Michael Czerner, and Christian Heiliger

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): Christian Franz, Michael Czerner, and Christian Heiliger The dependence of tunneling magnetoresistance and spin-transfer torque in FeCo/MgO/FeCo tunnel junctions on the Co concentration and the bias voltage are investigated ab initio . We find that the tunneling magnetoresistance decreases with the Co concentration, in contradiction to previous calculation... [Phys. Rev. B 88, 094421] Published Mon Sep 16, 2013

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Spin-transfer torque and current-induced switching in metallic spin valves with perpendicular polarizers (2013)

Pavel Baláž, Maciej Zwierzycki, and Józef Barnaś

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Pavel Baláž, Maciej Zwierzycki, and Józef Barnaś We present a theoretical description of spin-transfer torque in a spin valve with perpendicularly magnetized polarizer. The polarizer consisting of several ultrathin layers is considered as a single interfacial magnetic scatterer between two nonmagnetic layers, and is included in the theory based on... [Phys. Rev. B 88, 094422] Published Mon Sep 16, 2013

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S=2 quasi-one-dimensional spin waves in CrCl_{2} (2013)

M. B. Stone, G. Ehlers, and G. E. Granroth

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): M. B. Stone, G. Ehlers, and G. E. Granroth We examine the magnetic excitation spectrum in the S =2 Heisenberg antiferromagnet CrCl 2 . Inelastic neutron scattering measurements on powder samples are able to determine the significant exchange interactions in this system. A large anisotropy gap is observed in the spectrum below the Néel temperatu... [Phys. Rev. B 88, 104413] Published Mon Sep 16, 2013

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Influence of Cr doping on the magnetic structure of the FeAs-strips compound CaFe_{4}As_{3}: A single-crystal neutron diffraction study (2013)

P. Manuel, L. C. Chapon, G. Trimarchi, I. S. Todorov, D. Y. Chung, B. Ouladdiaf, M. J. Gutmann, A. J. Freeman, and M. G. Kanatzidis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): P. Manuel, L. C. Chapon, G. Trimarchi, I. S. Todorov, D. Y. Chung, B. Ouladdiaf, M. J. Gutmann, A. J. Freeman, and M. G. Kanatzidis We have studied the magnetic structure of a Cr-doped iron-arsenide compound CaFe 4 As 3 by means of single crystal neutron diffraction. The neutron data reveal that below 90 K, an antiferromagnetic structure with propagation vector k =0 is adopted. Refinement of the magnetic structure using one of the m... [Phys. Rev. B 88, 104414] Published Tue Sep 17, 2013

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Bañados-Silk-West effect with nongeodesic particles: Extremal horizons (2013)

I. V. Tanatarov and O. B. Zaslavskii

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): I. V. Tanatarov and O. B. Zaslavskii The Bañados-Silk-West effect consists in the possibility to obtain arbitrarily large energy E c.m. in the center of mass frame of two colliding particles near the black hole horizon. One of the common beliefs was that the action of force on these particles (say, due to gravitational radiation) should... [Phys. Rev. D 88, 064036] Published Tue Sep 17, 2013

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Twisted self-duality for linearized gravity in D dimensions (2013)

Claudio Bunster, Marc Henneaux, and Sergio Hörtner

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Claudio Bunster, Marc Henneaux, and Sergio Hörtner The linearized Einstein equations in D spacetime dimensions can be written as twisted self-duality equations expressing that the linearized curvature tensor of the graviton described by a rank-2 symmetric tensor is dual to the linearized curvature tensor of the “dual graviton” described by a tensor ... [Phys. Rev. D 88, 064032] Published Tue Sep 17, 2013

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Electromagnetic two-point functions and the Casimir effect in Friedmann-Robertson-Walker cosmologies (2013)

S. Bellucci and A. A. Saharian

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): S. Bellucci and A. A. Saharian We evaluate the two-point functions of the electromagnetic field in ( D +1)-dimensional spatially flat Friedmann–Robertson–Walker universes with a power-law scale factor, assuming that the field is prepared in the Bunch–Davies vacuum state. The range of powers is specified in which the two-point funct... [Phys. Rev. D 88, 064034] Published Tue Sep 17, 2013

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Scalar field propagation in higher dimensional black holes at a Lifshitz point (2013)

Elcio Abdalla, Owen Pavel Fernandez Piedra, Fidel Sosa Nuñez, and Jeferson de Oliveira

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Elcio Abdalla, Owen Pavel Fernandez Piedra, Fidel Sosa Nuñez, and Jeferson de Oliveira We study the complete time evolution of scalar fields propagating in spacetimes of higher-dimensional Lifshitz black holes with the dynamical critical exponent z =2, obtained from a theory including the most general quadratic curvature corrections to Einstein-Hilbert gravity in D dimensions. We also ... [Phys. Rev. D 88, 064035] Published Tue Sep 17, 2013

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Nanostripe of subwavelength width as a switchable semitransparent mirror for spin waves in a magnonic crystal (2013)

R. Huber, T. Schwarze, and D. Grundler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): R. Huber, T. Schwarze, and D. Grundler Spin wave transmission experiments are performed on a one-dimensional magnonic crystal (MC) where an injection pad for domain walls reverses the magnetization M of selected nanostripes independently from the otherwise saturated MC. The MC consists of a periodic array of 255-nm-wide permalloy nanostr... [Phys. Rev. B 88, 100405] Published Wed Sep 18, 2013

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Large spin pumping from epitaxial Y_{3}Fe_{5}O_{12} thin films to Pt and W layers (2013)

H. L. Wang, C. H. Du, Y. Pu, R. Adur, P. C. Hammel, and F. Y. Yang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): H. L. Wang, C. H. Du, Y. Pu, R. Adur, P. C. Hammel, and F. Y. Yang Epitaxial Y 3 Fe 5 O 12 thin films deposited by off-axis sputtering exhibit excellent crystalline quality enabling observation of large spin pumping signals in Pt/Y 3 Fe 5 O 12 and W/Y 3 Fe 5 O 12 bilayers driven by cavity ferromagnetic resonance. The inverse spin Hall voltages reach 2.10 and −5.26 mV in 5-mm-long... [Phys. Rev. B 88, 100406] Published Wed Sep 18, 2013

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Spin precession in inertial and gravitational fields (2013)

Bahram Mashhoon and Yuri N. Obukhov

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): Bahram Mashhoon and Yuri N. Obukhov We discuss the motion of spin in inertial and gravitational fields. The coupling of spin with rotation and the gravitomagnetic field has already been extensively studied; therefore, we focus here on the inertial and gravitational spin-orbit couplings. In particular, we investigate the classical and ... [Phys. Rev. D 88, 064037] Published Wed Sep 18, 2013

Schlagwort(e): General relativity, gravitation

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Weak ferromagnetism and domain effects in multiferroic LiNbO_{3}-type MnTiO_{3}-II (2013)

Angel M. Arévalo-López and J. Paul Attfield

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): Angel M. Arévalo-López and J. Paul Attfield Magnetic order consistent with multiferroism has been observed in the acentric LiNbO 3 -type, high pressure form II of MnTiO 3 using neutron diffraction and magnetization measurements. Spin order below the 28 K magnetic transition has propagation vector (0 0 0), and spins lie in the a b plane. Represent... [Phys. Rev. B 88, 104416] Published Wed Sep 18, 2013

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Second harmonic generation in magnetic nanoparticles with vortex magnetic state (2013)

V. L. Krutyanskiy, I. A. Kolmychek, B. A. Gribkov, E. A. Karashtin, E. V. Skorohodov, and T. V. Murzina

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): V. L. Krutyanskiy, I. A. Kolmychek, B. A. Gribkov, E. A. Karashtin, E. V. Skorohodov, and T. V. Murzina Nonlinear optical properties of a regular array of triangular-shaped vortex magnetic nanoparticles is studied using the optical second harmonic generation (SHG) technique. We demonstrate that the SHG azimuthal anisotropy is consistent with the 3 m symmetry of individual Co nanodots placed in a square... [Phys. Rev. B 88, 094424] Published Thu Sep 19, 2013

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Global cosmological dynamics for the scalar field representation of the modified Chaplygin gas (2013)

Claes Uggla

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): Claes Uggla In this paper we investigate the global dynamics for the minimally coupled scalar field representation of the modified Chaplygin gas in the context of flat Friedmann-Lemaître-Robertson Walker cosmology. The tool for doing this is a new set of bounded variables that lead to a regular dynamical system... [Phys. Rev. D 88, 064040] Published Thu Sep 19, 2013

Schlagwort(e): General relativity, gravitation

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Generalized Fermat’s principle and action for light rays in a curved spacetime (2013)

Valeri P. Frolov

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): Valeri P. Frolov We start with formulation of the generalized Fermat’s principle for light propagation in a curved spacetime. We apply Pontryagin’s minimum principle of the optimal control theory and obtain an effective Hamiltonian for null geodesics in a curved spacetime. We explicitly demonstrate that dynamical eq... [Phys. Rev. D 88, 064039] Published Thu Sep 19, 2013

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Monopole-based formalism for the diagonal magnetoelectric response (2013)

Nicola A. Spaldin, Michael Fechner, Eric Bousquet, Alexander Balatsky, and Lars Nordström

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Nicola A. Spaldin, Michael Fechner, Eric Bousquet, Alexander Balatsky, and Lars Nordström We develop the formalism of the macroscopic monopolization—that is, the magnetoelectric monopole moment per unit volume—in periodic solids, and discuss its relationship to the magnetoelectric effect. For the series of lithium transition metal phosphate compounds, we use first-principles density func... [Phys. Rev. B 88, 094429] Published Mon Sep 23, 2013

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Cosmic censorship, black holes and integer-spin test fields (2013)

Koray Düztaş and İbrahim Semiz

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Koray Düztaş and İbrahim Semiz It has been argued that, starting with a slightly subextremal Kerr black hole instead of an extremal one, it is possible to overspin a black hole past the extremal limit and turn it into a naked singularity by sending test bodies, if one neglects radiative and self-force effects. In this work we sho... [Phys. Rev. D 88, 064043] Published Mon Sep 23, 2013

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Structural, electronic, and magnetic properties of the europium chalcogenides: A hybrid-functional DFT study (2013)

Martin Schlipf, Markus Betzinger, Marjana Ležaić, Christoph Friedrich, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Martin Schlipf, Markus Betzinger, Marjana Ležaić, Christoph Friedrich, and Stefan Blügel We analyze the structural, electronic, and magnetic properties of the europium chalcogenide series Eu X ( X =O, S, Se, and Te) using density-functional theory (DFT). To describe the localized 4 f states of Eu, we utilize the parameter-free PBE0 and HSE hybrid functionals and found a systematic qualitati... [Phys. Rev. B 88, 094433] Published Wed Sep 25, 2013

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Dynamical exchange interaction from time-dependent spin density functional theory (2013)

Maria Stamenova and Stefano Sanvito

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Maria Stamenova and Stefano Sanvito We report on ab initio time-dependent spin-dynamics simulations for a two-center magnetic molecular complex within the framework of the time-dependent noncollinear spin-density functional theory. In particular, we discuss how the dynamical behavior of the ab initio spin-density in the time domain ca... [Phys. Rev. B 88, 104423] Published Wed Sep 25, 2013

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Reduced massive gravity with two Stückelberg fields (2013)

Lasma Alberte and Andrei Khmelnitsky

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Lasma Alberte and Andrei Khmelnitsky We consider the nonlinear massive gravity as a theory of a number of Stückelberg scalar fields minimally coupled to the Einstein-Hilbert gravity and argue that the counting of degrees of freedom can be done for scalar theory and gravity separately. In this paper we investigate the system with only t... [Phys. Rev. D 88, 064053] Published Wed Sep 25, 2013

Schlagwort(e): General relativity, gravitation

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Interplay between surface anisotropy and dipolar interactions in an assembly of nanomagnets (2013)

Z. Sabsabi, F. Vernay, O. Iglesias, and H. Kachkachi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Z. Sabsabi, F. Vernay, O. Iglesias, and H. Kachkachi We study the interplay between the effects of surface anisotropy and dipolar interactions in monodisperse assemblies of nanomagnets with oriented anisotropy. We derive asymptotic formulas for the assembly magnetization, taking into account temperature, applied field, core and surface anisotropy, and... [Phys. Rev. B 88, 104424] Published Wed Sep 25, 2013

Schlagwort(e): Magnetism

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Consistency of nonminimally coupled f(R) gravity (2013)

Nicola Tamanini and Tomi S. Koivisto

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Nicola Tamanini and Tomi S. Koivisto Theories with a nonminimal coupling between the space-time curvature and matter fields introduce an extra force due to the nonconservation of the matter energy momentum. In the present work the theoretical consistency of such couplings is studied using a scalar field Lagrangian to model the matter c... [Phys. Rev. D 88, 064052] Published Wed Sep 25, 2013

Schlagwort(e): General relativity, gravitation

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Large Seebeck magnetic anisotropy in thin Co films embedded in Cu determined by ab initio investigations (2013)

Voicu Popescu and Peter Kratzer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Voicu Popescu and Peter Kratzer The longitudinal thermopower of a Cu/Co/Cu trilayer system exhibits an oscillatory dependence on the thickness of the Co layer, a behavior related to the formation of quantum well states in the minority spin channel. In addition, it is found to be very sensitive to a switching between an in-plane an... [Phys. Rev. B 88, 104425] Published Wed Sep 25, 2013

Schlagwort(e): Magnetism

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Eccentric black hole mergers and zoom-whirl behavior from elliptic inspirals to hyperbolic encounters (2013)

Roman Gold and Bernd Brügmann

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Roman Gold and Bernd Brügmann We perform a parameter study of nonspinning, equal- and unequal-mass black hole binaries on generic, eccentric orbits in numerical relativity. The linear momentum considered ranges from that of a circular orbit to ten times that value. We discuss the different manifestations of zoom-whirl behavior i... [Phys. Rev. D 88, 064051] Published Wed Sep 25, 2013

Schlagwort(e): General relativity, gravitation

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Response to a twist in systems with Z_{p} symmetry: The two-dimensional p-state clock model (2013)

Yuta Kumano, Koji Hukushima, Yusuke Tomita, and Masaki Oshikawa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Yuta Kumano, Koji Hukushima, Yusuke Tomita, and Masaki Oshikawa We study response to a twist in the two-dimensional p -state clock model, which has the discrete Z p symmetry. The response is measured in terms of helicity modulus, which is usually defined with respect to an infinitesimal twist. However, we demonstrate that such a definition is inappropriate for the... [Phys. Rev. B 88, 104427] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Spin torque in magnetic tunnel junctions with asymmetric barriers (2013)

Alan Kalitsov, Whasington Silvestre, Mairbek Chshiev, and Julian P. Velev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Alan Kalitsov, Whasington Silvestre, Mairbek Chshiev, and Julian P. Velev We derive expressions for both parallel and perpendicular components of spin transfer torque (STT) in magnetic tunnel junctions (MTJs), which have several important advantages over the currently available expressions: First they are derived in a more realistic approximation, resulting in excellent a... [Phys. Rev. B 88, 104430] Published Mon Sep 30, 2013

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Interlayer coupling in spin valves studied by broadband ferromagnetic resonance (2013)

D. E. Gonzalez-Chavez, R. Dutra, W. O. Rosa, T. L. Marcondes, A. Mello, and R. L. Sommer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): D. E. Gonzalez-Chavez, R. Dutra, W. O. Rosa, T. L. Marcondes, A. Mello, and R. L. Sommer The magnetization dynamics of coupled and uncoupled spin valves with the structure NiFe (20 nm)/Cu( t Cu )/NiFe (20 nm)/IrMn (10 nm) is probed by broadband ferromagnetic resonance absorption measurements. The coupling intensity between the free and the pinned layers is tailored by varying the Cu thickn... [Phys. Rev. B 88, 104431] Published Mon Sep 30, 2013

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Universal corrections to the entanglement entropy in gapped quantum spin chains: A numerical study (2013)

Emanuele Levi, Olalla A. Castro-Alvaredo, and Benjamin Doyon

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Emanuele Levi, Olalla A. Castro-Alvaredo, and Benjamin Doyon We carry out a numerical study of the bipartite entanglement entropy in the gapped regime of two paradigmatic quantum spin chain models: the Ising chain in an external magnetic field and the antiferromagnetic XXZ model. The universal scaling limit of these models is described by the massive Ising fi... [Phys. Rev. B 88, 094439] Published Mon Sep 30, 2013

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Modification of magnetic anisotropy through 3d-4f coupling in La_{0.75}Pr_{0.25}Co_{2}P_{2} (2013)

Kirill Kovnir, Corey M. Thompson, V. Ovidiu Garlea, Daniel Haskel, Anatolii A. Polyanskii, Haidong Zhou, and Michael Shatruk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Kirill Kovnir, Corey M. Thompson, V. Ovidiu Garlea, Daniel Haskel, Anatolii A. Polyanskii, Haidong Zhou, and Michael Shatruk Magnetic behavior of La 0.75 Pr 0.25 Co 2 P 2 was investigated by a combination of magnetic measurements, magneto-optical imaging, neutron diffraction, and x-ray absorption spectroscopy, including x-ray magnetic circular dichroism. The material crystallizes in the ThCr 2 Si 2 structure type and exhibits three... [Phys. Rev. B 88, 104429] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Competition between spin-orbit coupling and magnetic exchange splitting in Ca_{2}RuO_{4} (2013)

Guo-Qiang Liu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Guo-Qiang Liu The ferromagnetic phase of Ca 2 RuO 4 has been puzzling because the observed magnetic moment m ≈ 0.4 μ B /Ru is surprisingly small, compared with the predicted 2 μ B /Ru. This discrepancy is resolved by considering the interplay of the spin-orbit coupling and Coulomb repulsion, which results in a large enhan... [Phys. Rev. B 88, 104428] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Big black hole, little neutron star: Magnetic dipole fields in the Rindler spacetime (2013)

Daniel J. D’Orazio and Janna Levin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Daniel J. D’Orazio and Janna Levin As a black hole and neutron star approach during inspiral, the field lines of a magnetized neutron star eventually thread the black hole event horizon and a short-lived electromagnetic circuit is established. The black hole acts as a battery that provides power to the circuit, thereby lighting up th... [Phys. Rev. D 88, 064059] Published Mon Sep 30, 2013

Schlagwort(e): General relativity, gravitation

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Initial data for neutron star binaries with arbitrary spins (2013)

Petr Tsatsin and Pedro Marronetti

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Petr Tsatsin and Pedro Marronetti The starting point of any general relativistic numerical simulation is a solution of the Hamiltonian and momentum constraints that (ideally) represents an astrophysically realistic scenario. We present a new method to produce initial data sets for binary neutron stars with arbitrary spins and orbita... [Phys. Rev. D 88, 064060] Published Mon Sep 30, 2013

Schlagwort(e): General relativity, gravitation

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Ab initio calculation of the effective on-site Coulomb interaction parameters for half-metallic magnets (2013)

Ersoy Şaşıoğlu, Iosif Galanakis, Christoph Friedrich, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Ersoy Şaşıoğlu, Iosif Galanakis, Christoph Friedrich, and Stefan Blügel Correlation effects play an important role in the electronic structure of half-metallic (HM) magnets. In particular, they give rise to nonquasiparticle states above (or below) the Fermi energy at finite temperatures that reduce the spin polarization and, as a consequence, the efficiency of spintroni... [Phys. Rev. B 88, 134402] Published Wed Oct 02, 2013

Schlagwort(e): Magnetism

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Ground state phase diagram of generic XY pyrochlore magnets with quantum fluctuations (2013)

Anson W. C. Wong, Zhihao Hao, and Michel J. P. Gingras

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-04

Beschreibung: Author(s): Anson W. C. Wong, Zhihao Hao, and Michel J. P. Gingras Motivated by recent experimental and theoretical progress on the Er 2 Ti 2 O 7 pyrochlore X Y antiferromagnet, we study the general problem of quantum order-by-disorder in pyrochlore X Y systems. We consider the nearest-neighbor pseudo-spin-1/2 Hamiltonian for such a system characterized by anisotropic spi... [Phys. Rev. B 88, 144402] Published Thu Oct 03, 2013

Schlagwort(e): Magnetism

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Possible realization of a multichannel Kondo model in a system of magnetic chains (2013)

A. M. Tsvelik and Wei-Guo Yin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-04

Beschreibung: Author(s): A. M. Tsvelik and Wei-Guo Yin We discuss a possible realization of overscreened N -channel Kondo model in quasi-one-dimensional magnets. We suggest that it is feasible to have arrangements for N from 2 to 6 and discuss the related quantum chemistry problems. [Phys. Rev. B 88, 144401] Published Thu Oct 03, 2013

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ESR of the quasi-two-dimensional antiferromagnet CuCrO_{2} with a triangular lattice (2013)

A. M. Vasiliev, L. A. Prozorova, L. E. Svistov, V. Tsurkan, V. Dziom, A. Shuvaev, Anna Pimenov, and A. Pimenov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-04

Beschreibung: Author(s): A. M. Vasiliev, L. A. Prozorova, L. E. Svistov, V. Tsurkan, V. Dziom, A. Shuvaev, Anna Pimenov, and A. Pimenov Using the electron-spin-resonance technique we investigate the magnetic structure of CuCrO 2 , a quasi-two-dimensional antiferromagnet with a weakly distorted triangular lattice. Resonance frequencies and the excitation conditions in CuCrO 2 at low temperatures are well described in the frame of cycloi... [Phys. Rev. B 88, 144403] Published Thu Oct 03, 2013

Schlagwort(e): Magnetism

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Massive gravity, the elasticity of space-time, and perturbations in the dark sector (2013)

Richard A. Battye and Jonathan A. Pearson

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-04

Beschreibung: Author(s): Richard A. Battye and Jonathan A. Pearson We consider a class of phenomenological modified gravity models where the terms added to the standard Einstein-Hilbert Lagrangian are just a function of the metric only. For linearized perturbations around an isotropic space-time, this class of models is entirely specified by a rank-4 tensor that en... [Phys. Rev. D 88, 084004] Published Thu Oct 03, 2013

Schlagwort(e): General relativity, gravitation

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Exchange interactions and local-moment fluctuation corrections in ferromagnets at finite temperatures based on noncollinear density-functional calculations (2013)

Marjana Ležaić, Phivos Mavropoulos, Gustav Bihlmayer, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): Marjana Ležaić, Phivos Mavropoulos, Gustav Bihlmayer, and Stefan Blügel We explore the derivation of interatomic exchange interactions in ferromagnets within density-functional theory (DFT) and the mapping of DFT results onto a spin Hamiltonian. We delve into the problem of systems comprising atoms with strong spontaneous moments together with atoms with weak induced mo... [Phys. Rev. B 88, 134403] Published Fri Oct 04, 2013

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Ferromagnetic ordering and half-metallic state of Sn_{2}Co_{3}S_{2} with the shandite-type structure (2013)

W. Schnelle, A. Leithe-Jasper, H. Rosner, F. M. Schappacher, R. Pöttgen, F. Pielnhofer, and R. Weihrich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): W. Schnelle, A. Leithe-Jasper, H. Rosner, F. M. Schappacher, R. Pöttgen, F. Pielnhofer, and R. Weihrich Single crystalline Sn 2 Co 3 S 2 with the shandite-type structure was investigated by magnetization, magnetoresistance, Hall effect, and heat capacity measurements and by 119 Sn Mößbauer spectroscopy. Sn 2 Co 3 S 2 orders ferromagnetically at 172 K with an easy-axis magnetization of ≈1 μ B along the hexagonal c ... [Phys. Rev. B 88, 144404] Published Fri Oct 04, 2013

Schlagwort(e): Magnetism

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Magnetic phase transition in the low-dimensional compound BaMn_{2}Si_{2}O_{7} (2013)

J. Ma, C. D. Dela Cruz, Tao Hong, W. Tian, A. A. Aczel, Songxue Chi, J.-Q. Yan, Z. L. Dun, H. D. Zhou, and M. Matsuda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): J. Ma, C. D. Dela Cruz, Tao Hong, W. Tian, A. A. Aczel, Songxue Chi, J.-Q. Yan, Z. L. Dun, H. D. Zhou, and M. Matsuda The structural and magnetic properties of BaMn 2 Si 2 O 7 have been investigated. The magnetic susceptibility and specific heat, measured using single crystals, suggest that the quasi-one-dimensional magnetism originating from the loosely coupled Mn 2+ chain carrying S =5/2 is present at high temperatures,... [Phys. Rev. B 88, 144405] Published Fri Oct 04, 2013

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Periastron advance in spinning black hole binaries: comparing effective-one-body and numerical relativity (2013)

Tanja Hinderer, Alessandra Buonanno, Abdul H. Mroué, Daniel A. Hemberger, Geoffrey Lovelace, Harald P. Pfeiffer, Lawrence E. Kidder, Mark A. Scheel, Bela Szilagyi, Nicholas W. Taylor, and Saul A. Teukolsky

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): Tanja Hinderer, Alessandra Buonanno, Abdul H. Mroué, Daniel A. Hemberger, Geoffrey Lovelace, Harald P. Pfeiffer, Lawrence E. Kidder, Mark A. Scheel, Bela Szilagyi, Nicholas W. Taylor, and Saul A. Teukolsky We compute the periastron advance using the effective-one-body formalism for binary black holes moving on quasicircular orbits and having spins collinear with the orbital angular momentum. We compare the predictions with the periastron advance recently computed in accurate numerical-relativity simul... [Phys. Rev. D 88, 084005] Published Fri Oct 04, 2013

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Unstable Schwarzschild-Tangherlini black holes in fourth-order gravity (2013)

Yun Soo Myung

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): Yun Soo Myung We study the stability of Schwarzschild-Tangherlini (ST) black holes in fourth-order gravity which provides a higher dimensional linearized massive equation. The linearized Ricci tensor perturbations are employed to exhibit unstable modes featuring the Gregory-Laflamme (GL) instability of higher dim... [Phys. Rev. D 88, 084006] Published Fri Oct 04, 2013

Schlagwort(e): General relativity, gravitation

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Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids (2013)

Matthias Althammer, Sibylle Meyer, Hiroyasu Nakayama, Michael Schreier, Stephan Altmannshofer, Mathias Weiler, Hans Huebl, Stephan Geprägs, Matthias Opel, Rudolf Gross, Daniel Meier, Christoph Klewe, Timo Kuschel, Jan-Michael Schmalhorst, Günter Reiss, Liming Shen, Arunava Gupta, Yan-Ting Chen, Gerrit E. W. Bauer, Eiji Saitoh, and Sebastian T. B. Goennenwein

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Matthias Althammer, Sibylle Meyer, Hiroyasu Nakayama, Michael Schreier, Stephan Altmannshofer, Mathias Weiler, Hans Huebl, Stephan Geprägs, Matthias Opel, Rudolf Gross, Daniel Meier, Christoph Klewe, Timo Kuschel, Jan-Michael Schmalhorst, Günter Reiss, Liming Shen, Arunava Gupta, Yan-Ting Chen, Gerrit E. W. Bauer, Eiji Saitoh, and Sebastian T. B. Goennenwein We experimentally investigate and quantitatively analyze the spin Hall magnetoresistance effect in ferromagnetic insulator/platinum and ferromagnetic insulator/nonferromagnetic metal/platinum hybrid structures. For the ferromagnetic insulator, we use either yttrium iron garnet, nickel ferrite, or ma... [Phys. Rev. B 87, 224401] Published Wed Jun 05, 2013

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Periodic magnetization structures generated by transverse spin current in magnetic nanowires (2013)

Volodymyr P. Kravchuk, Oleksii M. Volkov, Denis D. Sheka, and Yuri Gaididei

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Volodymyr P. Kravchuk, Oleksii M. Volkov, Denis D. Sheka, and Yuri Gaididei The magnetization behavior of long nanowires with square cross section under the influence of strong perpendicular spin-polarized current is studied theoretically. The study is based on Landau-Lifshitz-Slonczewski phenomenology. Without the current the wire is magnetized uniformly along its axis. Fo... [Phys. Rev. B 87, 224402] Published Wed Jun 05, 2013

Schlagwort(e): Magnetism

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Gravitational wave parameter estimation with compressed likelihood evaluations (2013)

Priscilla Canizares, Scott E. Field, Jonathan R. Gair, and Manuel Tiglio

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Priscilla Canizares, Scott E. Field, Jonathan R. Gair, and Manuel Tiglio One of the main bottlenecks in gravitational wave (GW) astronomy is the high cost of performing parameter estimation and GW searches on the fly. We propose a novel technique based on reduced order quadratures (ROQs), an application and data-specific quadrature rule, to perform fast and accurate like... [Phys. Rev. D 87, 124005] Published Wed Jun 05, 2013

Schlagwort(e): General relativity, gravitation

Print ISSN: 0556-2821

Digitale ISSN: 1089-4918

Thema: Physik

Publiziert von American Physical Society (APS)

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Role of critical spin fluctuations in ultrafast demagnetization of transition-metal rare-earth alloys (2013)

V. López-Flores, N. Bergeard, V. Halté, C. Stamm, N. Pontius, M. Hehn, E. Otero, E. Beaurepaire, and C. Boeglin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-12

Beschreibung: Author(s): V. López-Flores, N. Bergeard, V. Halté, C. Stamm, N. Pontius, M. Hehn, E. Otero, E. Beaurepaire, and C. Boeglin Ultrafast magnetization dynamics induced by femtosecond laser pulses have been measured in ferrimagnetic Co 0.8 Gd 0.2 , Co 0.74 Tb 0.26 , and Co 0.86 Tb 0.14 alloys. Using element sensitivity of x-ray magnetic circular dichroism at the Co L 3 , Tb M 5 , and Gd M 5 edges, we see that the demagnetization dynamics is... [Phys. Rev. B 87, 214412] Published Tue Jun 11, 2013

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Inner accretion disk edges in a Kerr-like spacetime (2013)

Tim Johannsen

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-06-12

Beschreibung: Author(s): Tim Johannsen According to the no-hair theorem, astrophysical black holes are uniquely described by the Kerr metric. In order to test this theorem with observations in either the electromagnetic or gravitational-wave spectra, several Kerr-like spacetimes have been constructed which describe potential deviations f... [Phys. Rev. D 87, 124010] Published Tue Jun 11, 2013

Schlagwort(e): General relativity, gravitation

Print ISSN: 0556-2821

Digitale ISSN: 1089-4918

Thema: Physik

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Coexistence of magnetic order and spin-glass-like phase in the pyrochlore antiferromagnet Na_{3}Co(CO_{3})_{2}Cl (2013)

Zhendong Fu, Yanzhen Zheng, Yinguo Xiao, Subhankar Bedanta, Anatoliy Senyshyn, Giovanna Giulia Simeoni, Yixi Su, Ulrich Rücker, Paul Kögerler, and Thomas Brückel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-07

Beschreibung: Author(s): Zhendong Fu, Yanzhen Zheng, Yinguo Xiao, Subhankar Bedanta, Anatoliy Senyshyn, Giovanna Giulia Simeoni, Yixi Su, Ulrich Rücker, Paul Kögerler, and Thomas Brückel We present comprehensive investigations on a pyrochlore antiferromagnet Na 3 Co(CO 3 ) 2 Cl. Performed dc magnetization indicates a broad maximum at around 4 K. The field dependence of the peak temperature of this maximum follows the de Almeida–Thouless line, suggesting a spin-glass-like phase transition.... [Phys. Rev. B 87, 214406] Published Thu Jun 06, 2013

Schlagwort(e): Magnetism

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Thema: Physik

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Entanglement, magnetism, and metal-insulator transitions in fermionic superlattices (2013)

Tiago Mendes-Santos, Thereza Paiva, and Raimundo R. dos Santos

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-08

Beschreibung: Author(s): Tiago Mendes-Santos, Thereza Paiva, and Raimundo R. dos Santos We discuss how entanglement of strongly correlated fermions is influenced by a superlattice structure by considering a one-dimensional Hubbard superlattice, made up of a repeated pattern of L U repulsive sites followed by L 0 free sites. Lanczos diagonalization of lattices up to 24 sites is used to ca... [Phys. Rev. B 87, 214407] Published Fri Jun 07, 2013

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

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Thema: Physik

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