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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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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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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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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

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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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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

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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

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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

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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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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

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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

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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

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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

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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

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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

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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

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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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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

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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

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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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Publikationsdatum: 2013-09-17

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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Publikationsdatum: 2013-09-17

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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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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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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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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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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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

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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

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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

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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

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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

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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

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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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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

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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

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In: Physical Review B

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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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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

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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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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

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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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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

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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

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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

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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

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Phonon-glass-like behavior of magnetic origin in single-crystal Tb_{2}Ti_{2}O_{7} (2013)

Q. J. Li, Z. Y. Zhao, C. Fan, F. B. Zhang, H. D. Zhou, X. Zhao, and X. F. Sun

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-08

Beschreibung: Author(s): Q. J. Li, Z. Y. Zhao, C. Fan, F. B. Zhang, H. D. Zhou, X. Zhao, and X. F. Sun We report a study on the thermal conductivity ( κ ) of Tb 2 Ti 2 O 7 single crystals at low temperatures. It is found that in zero field this material has an extremely low phonon thermal conductivity in a broad temperature range. The mean free path of phonons is even smaller than that of amorphous material... [Phys. Rev. B 87, 214408] Published Fri Jun 07, 2013

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On the half-metallicity of Co_{2}FeSi Heusler alloy: Point-contact Andreev reflection spectroscopy and ab initio study (2013)

L. Makinistian, Muhammad M. Faiz, Raghava P. Panguluri, B. Balke, S. Wurmehl, C. Felser, E. A. Albanesi, A. G. Petukhov, and B. Nadgorny

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-08

Beschreibung: Author(s): L. Makinistian, Muhammad M. Faiz, Raghava P. Panguluri, B. Balke, S. Wurmehl, C. Felser, E. A. Albanesi, A. G. Petukhov, and B. Nadgorny Co 2 FeSi, a Heusler alloy with the highest magnetic moment per unit cell and the highest Curie temperature, has largely been described theoretically as a half-metal. This conclusion, however, disagrees with point contact Andreev reflection (PCAR) spectroscopy measurements, which give much lower value... [Phys. Rev. B 87, 220402] Published Fri Jun 07, 2013

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Spin-1/2 Heisenberg antiferromagnet on the kagome lattice: Z_{2} spin liquid with fermionic spinons (2013)

Zhihao Hao and Oleg Tchernyshyov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Zhihao Hao and Oleg Tchernyshyov Motivated by recent numerical and experimental studies of the spin-1/2 Heisenberg antiferromagnet on the kagome lattice, we formulate a many-body model for fermionic spinons introduced by us earlier [ Phys. Rev. Lett. 103 187203 (2009) ]. The spinons interact with an emergent U (1) gauge field and ex... [Phys. Rev. B 87, 214404] Published Wed Jun 05, 2013

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Complex magnetic phase diagram of a geometrically frustrated Sm lattice: Magnetometry and neutron diffraction study of SmPd_{2}Al_{3} (2013)

J. Pospíšil, G. Nénert, S. Miyashita, H. Kitazawa, Y. Skourski, M. Diviš, J. Prokleška, and V. Sechovský

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): J. Pospíšil, G. Nénert, S. Miyashita, H. Kitazawa, Y. Skourski, M. Diviš, J. Prokleška, and V. Sechovský Magnetism in SmPd 2 Al 3 was investigated on a single crystal by magnetometry and neutron diffraction. SmPd 2 Al 3 represents a distinctive example of a Sm magnetism exhibiting complex magnetic behavior at low temperatures with four consecutive magnetic phase transitions at 3.4, 3.9, 4.4, and 12.5 K. The ... [Phys. Rev. B 87, 214405] Published Wed Jun 05, 2013

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Magnetic phase diagram of Sr_{3}Fe_{2}O_{7−δ} (2013)

D. C. Peets, J.-H. Kim, P. Dosanjh, M. Reehuis, A. Maljuk, N. Aliouane, C. Ulrich, and B. Keimer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): D. C. Peets, J.-H. Kim, P. Dosanjh, M. Reehuis, A. Maljuk, N. Aliouane, C. Ulrich, and B. Keimer Magnetometry, electrical transport, and neutron scattering measurements were performed on single crystals of the Fe 4+ -containing perovskite-related phase Sr 3 Fe 2 O 7− δ as a function of oxygen content. Although both the crystal structure and electron configuration of this compound are closely similar to... [Phys. Rev. B 87, 214410] Published Mon Jun 10, 2013

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Magnetic and magnetoelastic properties of UCo_{2}Si_{2} as studied by high-field magnetization and ultrasound measurements (2013)

A. V. Andreev, S. Yasin, Y. Skourski, A. A. Zvyagin, S. Zherlitsyn, and J. Wosnitza

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): A. V. Andreev, S. Yasin, Y. Skourski, A. A. Zvyagin, S. Zherlitsyn, and J. Wosnitza We investigated an antiferromagnet UCo 2 Si 2 by use of magnetization and ultrasound measurements in pulsed magnetic fields up to 60 T. It is found that the crystal UCo 2 Si 2 , which has the antiferromagnet type-I magnetic structure in zero field below T N = 83 K, undergoes the metamagnetic phase transitio... [Phys. Rev. B 87, 214409] Published Mon Jun 10, 2013

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Microscopic coexistence of antiferromagnetic and spin-glass states (2013)

Sh. Chillal, M. Thede, F. J. Litterst, S. N. Gvasaliya, T. A. Shaplygina, S. G. Lushnikov, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): Sh. Chillal, M. Thede, F. J. Litterst, S. N. Gvasaliya, T. A. Shaplygina, S. G. Lushnikov, and A. Zheludev The disordered antiferromagnet PbFe 1/2 Nb 1/2 O 3 is investigated in a wide temperature range by combining Mössbauer spectroscopy and neutron diffraction experiments. It is demonstrated that the magnetic ground state is a microscopic coexistence of antiferromagnetic and spin-glass orders. This speromagn... [Phys. Rev. B 87, 220403] Published Mon Jun 10, 2013

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Emergence of ferromagnetism and Jahn-Teller distortion in LaMn_{1−x}Cr_{x}O_{3} (x〈0.15) (2013)

Aline Y. Ramos, Hélio C. N. Tolentino, Márcio M. Soares, Stéphane Grenier, Oana Bunău, Yves Joly, François Baudelet, Fabrice Wilhelm, Andrei Rogalev, Raquel A. Souza, Narcizo M. Souza-Neto, Olivier Proux, Denis Testemale, and Alberto Caneiro

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): Aline Y. Ramos, Hélio C. N. Tolentino, Márcio M. Soares, Stéphane Grenier, Oana Bunău, Yves Joly, François Baudelet, Fabrice Wilhelm, Andrei Rogalev, Raquel A. Souza, Narcizo M. Souza-Neto, Olivier Proux, Denis Testemale, and Alberto Caneiro The emergence of a ferromagnetic component in LaMnO 3 with low Cr-for-Mn substitution has been studied by x-ray absorption spectroscopy and x-ray magnetic circular dichroism at the Mn and Cr K edges. The local magnetic moment strengths for Mn and Cr are proportional to each other and follow the macro... [Phys. Rev. B 87, 220404] Published Mon Jun 10, 2013

Schlagwort(e): Magnetism

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Electronic structure and magnetic symmetry in MnTiO_{3} analyzed by second harmonic generation (2013)

Judy G. Cherian, Takahisa D. Tokumoto, Haidong Zhou, Eun Sang Choi, and Stephen A. McGill

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): Judy G. Cherian, Takahisa D. Tokumoto, Haidong Zhou, Eun Sang Choi, and Stephen A. McGill Second harmonic generation (SHG) and linear absorbance spectra of MnTiO 3 were measured and the 1.88, 2.41, 2.63, and 3.06 eV SHG features were identified as d - d optical transitions from 6 A 1 g to 4 T 1 g ( 4 G ), 4 T 2 g ( 4 G ), { 4 E g , 4 A 1 g ( 4 G )}, and 4 E g ( 4 D ), respectively. These zero-phonon transitions were used to ... [Phys. Rev. B 87, 214411] Published Mon Jun 10, 2013

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Microscopic origin of magnetic linear dichroism in the antiferromagnetic insulator MnF_{2} (2013)

Takuya Higuchi and Makoto Kuwata-Gonokami

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): Takuya Higuchi and Makoto Kuwata-Gonokami Magnetically ordered crystals often show unique magneto-optical phenomena that are not found without magnetic order. For example, MnF 2 , a two-sublattice antiferromagnet with different sublattice symmetries shows magnetic linear dichroism (MLD), which is odd with respect to the external magnetic fiel... [Phys. Rev. B 87, 224405] Published Mon Jun 10, 2013

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Dy-V magnetic interaction and local structure bias on the complex spin and orbital ordering in Dy_{1−x}Tb_{x}VO_{3} (x=0 and 0.2) (2013)

J.-Q. Yan, H. B. Cao, M. A. McGuire, Y. Ren, B. C. Sales, and D. G. Mandrus

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): J.-Q. Yan, H. B. Cao, M. A. McGuire, Y. Ren, B. C. Sales, and D. G. Mandrus The spin and orbital ordering in Dy 1− x Tb x VO 3 ( x =0 and 0.2) was studied by measuring x-ray powder diffraction, magnetization, specific heat, and neutron single-crystal diffraction. The results show that G-OO/C-AF and C-OO/G-AF phases coexist in Dy 0.8 Tb 0.20 VO 3 in the temperature range 2–60 K, and the ... [Phys. Rev. B 87, 224404] Published Mon Jun 10, 2013

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Dynamics and relaxation in spin nematics (2013)

V. G. Bar'yakhtar, V. I. Butrim, A. K. Kolezhuk, and B. A. Ivanov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): V. G. Bar'yakhtar, V. I. Butrim, A. K. Kolezhuk, and B. A. Ivanov We study the dynamics and relaxation of elementary excitations (magnons) in the spin nematic (quadrupole ordered) phase of S =1 magnets. We develop a general phenomenological theory of spin dynamics and relaxation for spin-1 systems. The results of the phenomenological approach are compared to those ... [Phys. Rev. B 87, 224407] Published Mon Jun 10, 2013

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Disorder-induced cubic phase in Fe_{2}-based Heusler alloys (2013)

Janos Kiss, Stanislav Chadov, Gerhard H. Fecher, and Claudia Felser

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): Janos Kiss, Stanislav Chadov, Gerhard H. Fecher, and Claudia Felser Based on the first-principles electronic structure calculations, we analyze the chemical and magnetic mechanisms stabilizing the cubic phase in Fe 2 -based Heusler materials, which were predicted to be tetragonal when being chemically ordered. In agreement with recent experimental data, we found that ... [Phys. Rev. B 87, 224403] Published Mon Jun 10, 2013

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Dimethylammonium copper formate [(CH_{3})_{2}NH_{2}]Cu(HCOO)_{3}: A metal-organic framework with quasi-one-dimensional antiferromagnetism and magnetostriction (2013)

Zhenxing Wang, Prashant Jain, Kwang-Yong Choi, Johan van Tol, Anthony K. Cheetham, Harold W. Kroto, Hyun-Joo Koo, Haidong Zhou, Jungmin Hwang, Eun Sang Choi, Myung-Hwan Whangbo, and Naresh S. Dalal

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): Zhenxing Wang, Prashant Jain, Kwang-Yong Choi, Johan van Tol, Anthony K. Cheetham, Harold W. Kroto, Hyun-Joo Koo, Haidong Zhou, Jungmin Hwang, Eun Sang Choi, Myung-Hwan Whangbo, and Naresh S. Dalal Metal-organic frameworks (MOFs) can exhibit many interesting properties such as multiferroic behavior, dipolar glass, gas storage, and protonic conductivity. Here we report that dimethylammonium copper formate (DMACuF) [(CH 3 ) 2 NH 2 ]Cu(HCOO) 3 , a cation templated nonporous MOF with perovskite topology, ... [Phys. Rev. B 87, 224406] Published Mon Jun 10, 2013

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Low-temperature anisotropic magnetoresistance and planar Hall effect in SrRuO_{3} (2013)

Noam Haham, Yishai Shperber, James W. Reiner, and Lior Klein

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-10

Beschreibung: Author(s): Noam Haham, Yishai Shperber, James W. Reiner, and Lior Klein SrRuO 3 is an itinerant ferromagnet with a Curie temperature of 150 K and a uniaxial magnetocrystalline anisotropy. Using high-quality epitaxial thin films, we measure at 2 K the anisotropic magnetoresistance and the planar Hall effect as a function of the in-plane current direction and the magnetiza... [Phys. Rev. B 87, 144407] Published Tue Apr 09, 2013

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Evolution of magnetic and crystal structures in the multiferroic FeTe_{2}O_{5}Br (2013)

M. Pregelj, P. Jeglič, A. Zorko, O. Zaharko, T. Apih, A. Gradišek, M. Komelj, H. Berger, and D. Arčon

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-10

Beschreibung: Author(s): M. Pregelj, P. Jeglič, A. Zorko, O. Zaharko, T. Apih, A. Gradišek, M. Komelj, H. Berger, and D. Arčon Neutron diffraction and nuclear quadrupole resonance (NQR) measurements were employed to investigate magnetic order in the nonferroelectric phase preceding the low-temperature multiferroic state in FeTe 2 O 5 Br. Refinement of the neutron diffraction data and simulations of 79,81 Br NQR spectra reveal th... [Phys. Rev. B 87, 144408] Published Tue Apr 09, 2013

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Gate-tunable exchange coupling between cobalt clusters on graphene (2013)

Hua Chen, Qian Niu, Zhenyu Zhang, and Allan H. Mac; Donald

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-11

Beschreibung: Author(s): Hua Chen, Qian Niu, Zhenyu Zhang, and Allan H. MacDonald We use spin density functional theory ab initio calculations to theoretically explore the possibility of achieving useful gate control over exchange coupling between cobalt clusters placed on a graphene sheet. By applying an electric field across supercells, we demonstrate that the exchange interact... [Phys. Rev. B 87, 144410] Published Wed Apr 10, 2013

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Even-odd effect in short antiferromagnetic Heisenberg chains (2013)

A. Machens, N. P. Konstantinidis, O. Waldmann, I. Schneider, and S. Eggert

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-11

Beschreibung: Author(s): A. Machens, N. P. Konstantinidis, O. Waldmann, I. Schneider, and S. Eggert Motivated by recent experiments on chemically synthesized magnetic molecular chains, we investigate the lowest-lying energy band of short spin- s antiferromagnetic Heisenberg chains focusing on effects of open boundaries. By numerical diagonalization we find that the Landé pattern in the energy level... [Phys. Rev. B 87, 144409] Published Wed Apr 10, 2013

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Effect of quantum well states in Cu overlayer on magnetic anisotropy of Fe and Co films revisited (2013)

S. Manna, P. L. Gastelois, M. Dąbrowski, P. Kuświk, M. Cinal, M. Przybylski, and J. Kirschner

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-02

Beschreibung: Author(s): S. Manna, P. L. Gastelois, M. Dąbrowski, P. Kuświk, M. Cinal, M. Przybylski, and J. Kirschner The effect of quantum well states (QWS) formed in a Cu overlayer on the magnetic anisotropy of Fe and of Co films underneath is investigated at low temperatures. An oscillatory magnetic anisotropy is observed below 50 K, with a period of L C u =5.8 ML, and it is the same for Cu/Fe and Cu/Co. We attribu... [Phys. Rev. B 87, 134401] Published Mon Apr 01, 2013

Schlagwort(e): Magnetism

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Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba_{3}B^{′}Ru_{2}O_{9} (B^{′} = La^{3+}, Nd^{3+}, and Y^{3+}) (2013)

Mark S. Senn, Simon A. J. Kimber, Angel M. Arevalo Lopez, Adrian H. Hill, and J. Paul Attfield

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-03

Beschreibung: Author(s): Mark S. Senn, Simon A. J. Kimber, Angel M. Arevalo Lopez, Adrian H. Hill, and J. Paul Attfield The magnetic and crystal structures of the title materials have been investigated using high-resolution neutron and synchrotron x-ray powder diffraction. Ferromagnetic Ru dimers are observed in the spin-ordered ground states of all three materials, evidencing an intradimer double exchange interactio... [Phys. Rev. B 87, 134402] Published Tue Apr 02, 2013

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Magnetoelectric resonances and predicted microwave diode effect of the skyrmion crystal in a multiferroic chiral-lattice magnet (2013)

Masahito Mochizuki and Shinichiro Seki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-04

Beschreibung: Author(s): Masahito Mochizuki and Shinichiro Seki We theoretically discover that unique eigenmodes of skyrmion crystal (SkX) are not only magnetically active to an ac magnetic field ( H ω ) but also electrically active to an ac electric field ( E ω ) in a multiferroic chiral-lattice magnet Cu 2 OSeO 3 , which amplifies the dynamical magnetoelectric coupling ... [Phys. Rev. B 87, 134403] Published Wed Apr 03, 2013

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Yb_{2}Sn_{2}O_{7}: A magnetic Coulomb liquid at a quantum critical point (2013)

Z. L. Dun, E. S. Choi, H. D. Zhou, A. M. Hallas, H. J. Silverstein, Y. Qiu, J. R. D. Copley, J. S. Gardner, and C. R. Wiebe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-11

Beschreibung: Author(s): Z. L. Dun, E. S. Choi, H. D. Zhou, A. M. Hallas, H. J. Silverstein, Y. Qiu, J. R. D. Copley, J. S. Gardner, and C. R. Wiebe We report neutron scattering and ac susceptibility measurements on the pyrochlore Yb 2 Sn 2 O 7 . The appearance of magnetic diffuse scattering, low-energy spin excitations, and a nearly temperature-independent relaxation time are signatures that the system enters a short-range-ordered regime with quantum... [Phys. Rev. B 87, 134408] Published Wed Apr 10, 2013

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Irreversible magnetic-field dependence of low-temperature heat transport of spin-ice compound Dy_{2}Ti_{2}O_{7} in a [111] field (2013)

C. Fan, Z. Y. Zhao, H. D. Zhou, X. M. Wang, Q. J. Li, F. B. Zhang, X. Zhao, and X. F. Sun

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-06

Beschreibung: Author(s): C. Fan, Z. Y. Zhao, H. D. Zhou, X. M. Wang, Q. J. Li, F. B. Zhang, X. Zhao, and X. F. Sun We study the low-temperature thermal conductivity ( κ ) of Dy 2 Ti 2 O 7 along and perpendicular to the (111) plane and under the magnetic field along the [111] direction. Besides the steplike decreases of κ at the field-induced transitions from the spin-ice state to the kagomé-ice state and then to the po... [Phys. Rev. B 87, 144404] Published Fri Apr 05, 2013

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Influence of short-range spin correlations on the μSR polarization functions in the slow dynamic limit: Application to the quantum spin-liquid system Yb_{2}Ti_{2}O_{7} (2013)

A. Yaouanc, A. Maisuradze, and P. Dalmas de Réotier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-06

Beschreibung: Author(s): A. Yaouanc, A. Maisuradze, and P. Dalmas de Réotier Here we discuss how to account for short-range spin correlations on the measured muon spin relaxation spectra. The shape of the zero-field relaxation function is found to be highly sensitive to short-range spin correlations, as clearly inferred from the analysis of the published longitudinal relaxat... [Phys. Rev. B 87, 134405] Published Fri Apr 05, 2013

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Exchange bias, training effect, and bimodal distribution of blocking temperatures in electrodeposited core-shell nanotubes (2013)

M. P. Proenca, J. Ventura, C. T. Sousa, M. Vazquez, and J. P. Araujo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-06

Beschreibung: Author(s): M. P. Proenca, J. Ventura, C. T. Sousa, M. Vazquez, and J. P. Araujo Co nanotubes (NTs) were electrodeposited inside nanoporous alumina templates by a potentiostatic method and then left in air for the natural oxidation of their inner walls. Temperature-dependent magnetic measurements evidenced the existence of exchange-bias (EB) coupling between the Co ferromagnetic... [Phys. Rev. B 87, 134404] Published Fri Apr 05, 2013

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Origin of multiferroicity in MnWO_{4} (2013)

I. V. Solovyev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-05

Beschreibung: Author(s): I. V. Solovyev MnWO 4 is regarded as a canonical example of multiferroic materials, where the multiferroic activity is caused by a spin-spiral alignment. We argue that, in reality, MnWO 4 has two sources of the spin spirality, which conflict with each other. One source is the Dzyaloshinskii-Moriya (DM) interactions,... [Phys. Rev. B 87, 144403] Published Thu Apr 04, 2013

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Atomistic spin dynamics of low-dimensional magnets (2013)

Lars Bergqvist, Andrea Taroni, Anders Bergman, Corina Etz, and Olle Eriksson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-05

Beschreibung: Author(s): Lars Bergqvist, Andrea Taroni, Anders Bergman, Corina Etz, and Olle Eriksson We investigate the magnetic properties of a range of low-dimensional ferromagnets using a combination of first-principles calculations and atomistic spin dynamics simulations. This approach allows us to evaluate the ground state and finite temperature properties of experimentally well characterized ... [Phys. Rev. B 87, 144401] Published Thu Apr 04, 2013

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Irreversible magnetization switching using surface acoustic waves (2013)

L. Thevenard, J.-Y. Duquesne, E. Peronne, H. J. von Bardeleben, H. Jaffres, S. Ruttala, J-M. George, A. Lemaître, and C. Gourdon

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-05

Beschreibung: Author(s): L. Thevenard, J.-Y. Duquesne, E. Peronne, H. J. von Bardeleben, H. Jaffres, S. Ruttala, J-M. George, A. Lemaître, and C. Gourdon An analytical and numerical approach is developed to pinpoint the optimal experimental conditions to irreversibly switch magnetization using surface acoustic waves (SAWs). The layers are magnetized perpendicular to the plane and two switching mechanisms are considered. In precessional switching, a s... [Phys. Rev. B 87, 144402] Published Thu Apr 04, 2013

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Field-dependent thermal conductivity and Lorenz number in Co/Cu multilayers (2013)

Johannes Kimling, Kornelius Nielsch, Karsten Rott, and Günter Reiss

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-09

Beschreibung: Author(s): Johannes Kimling, Kornelius Nielsch, Karsten Rott, and Günter Reiss The influence of inelastic scattering mechanisms on the giant magnetoresistance (GMR) effect has been controversially discussed. This issue can be addressed, for example, by comparing charge currents with heat currents in magnetic multilayers that exhibit GMR. The interpretation of such experiments ... [Phys. Rev. B 87, 134406] Published Mon Apr 08, 2013

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Improper ferroelectricity and multiferroism in 2H-BaMnO_{3} (2013)

Julien Varignon and Philippe Ghosez

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-09

Beschreibung: Author(s): Julien Varignon and Philippe Ghosez Using first-principles calculations, we study theoretically the stable 2 H hexagonal structure of BaMnO 3 . We show that from the stable high-temperature P 6 3 / m m c structure, the compound should exhibit an improper ferroelectric structural phase transition to a P 6 3 c m ground state. Combined with its antif... [Phys. Rev. B 87, 140403] Published Mon Apr 08, 2013

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Realization of higher Wess-Zumino-Witten models in spin chains (2013)

Frédéric Michaud, Salvatore R. Manmana, and Frédéric Mila

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-10

Beschreibung: Author(s): Frédéric Michaud, Salvatore R. Manmana, and Frédéric Mila Building on the generalization of the exactly dimerized Majumdar-Ghosh ground state to arbitrary spin S for the Heisenberg chain with a three-site term ( S i −1 · S i )( S i · S i +1 )+H.c., we use density-matrix renormalization group simulations and exact diagonalizations to determine the nature of the dimerizat... [Phys. Rev. B 87, 140404] Published Tue Apr 09, 2013

Schlagwort(e): Magnetism

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Phase transitions in the frustrated Ising model on the square lattice (2013)

Songbo Jin, Arnab Sen, Wenan Guo, and Anders W. Sandvik

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-10

Beschreibung: Author(s): Songbo Jin, Arnab Sen, Wenan Guo, and Anders W. Sandvik We consider the thermal phase transition from a paramagnetic to a stripe-antiferromagnetic phase in the frustrated two-dimensional square-lattice Ising model with competing interactions J 1 〈0 (nearest neighbor, ferromagnetic) and J 2 〉0 (second neighbor, antiferromagnetic). The striped phase brea... [Phys. Rev. B 87, 144406] Published Tue Apr 09, 2013

Schlagwort(e): Magnetism

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Magnetic and electronic properties of NpCo_{2}: Evidence for long-range magnetic order (2013)

J. P. Sanchez, J.-C. Griveau, P. Javorsky, E. Colineau, R. Eloirdi, P. Boulet, J. Rebizant, F. Wastin, A. B. Shick, and R. Caciuffo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-04-11

Beschreibung: Author(s): J. P. Sanchez, J.-C. Griveau, P. Javorsky, E. Colineau, R. Eloirdi, P. Boulet, J. Rebizant, F. Wastin, A. B. Shick, and R. Caciuffo The magnetic and electronic properties of the cubic Laves phase intermetallic compound NpCo 2 have been investigated by magnetization, specific heat, and electrical resistivity measurements. Magnetization data confirm previous results, i.e., an antiferromagneticlike order at 12.5 K and a metamagnetic... [Phys. Rev. B 87, 134410] Published Wed Apr 10, 2013

Schlagwort(e): Magnetism

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Dynamical Jahn-Teller effect in a spin-orbital coupled system (2013)

Joji Nasu and Sumio Ishihara

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-07

Beschreibung: Author(s): Joji Nasu and Sumio Ishihara Dynamical Jahn-Teller (DJT) effect in a spin-orbital coupled system on a honeycomb lattice is examined, motivated from recently observed spin-liquid behavior in Ba 3 CuSb 2 O 9 . An effective vibronic Hamiltonian, where the superexchange interaction and the DJT effect are taken into account, is derived. W... [Phys. Rev. B 88, 094408] Published Fri Sep 06, 2013

Schlagwort(e): Magnetism

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Magnon, phonon, and electron temperature profiles and the spin Seebeck effect in magnetic insulator/normal metal hybrid structures (2013)

Michael Schreier, Akashdeep Kamra, Mathias Weiler, Jiang Xiao, Gerrit E. W. Bauer, Rudolf Gross, and Sebastian T. B. Goennenwein

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): Michael Schreier, Akashdeep Kamra, Mathias Weiler, Jiang Xiao, Gerrit E. W. Bauer, Rudolf Gross, and Sebastian T. B. Goennenwein We calculate the phonon, electron, and magnon temperature profiles in yttrium iron garnet/platinum bilayers by diffusive theory with appropriate boundary conditions, in particular taking into account interfacial thermal resistances. Our calculations show that in thin film hybrids, the interface magn... [Phys. Rev. B 88, 094410] Published Mon Sep 09, 2013

Schlagwort(e): Magnetism

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Berry phases, current lattices, and suppression of phase transitions in a lattice gauge theory of quantum antiferromagnets (2013)

Troels Arnfred Bojesen and Asle Sudbø

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): Troels Arnfred Bojesen and Asle Sudbø We consider a lattice model of two complex scalar matter fields z a , a =1,2, under a CP 1 constraint | z 1 | 2 +| z 2 | 2 =1, minimally coupled to a compact gauge field, with an additional Berry-phase term. This model has been the origin of a large body of works addressing novel paradigms for quantum criticality... [Phys. Rev. B 88, 094412] Published Mon Sep 09, 2013

Schlagwort(e): Magnetism

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Role of Te in the low-dimensional multiferroic material FeTe_{2}O_{5}Br (2013)

Jayita Chakraborty, Nirmal Ganguli, Tanusri Saha-Dasgupta, and Indra Dasgupta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): Jayita Chakraborty, Nirmal Ganguli, Tanusri Saha-Dasgupta, and Indra Dasgupta Using first principles density functional calculations, we study the electronic structure of the low-dimensional multiferroic compound FeTe 2 O 5 Br to investigate the origin of the magnetoelectric (ME) effect and the role of Te ions in this system. We find that without magnetism, even in the presence o... [Phys. Rev. B 88, 094409] Published Mon Sep 09, 2013

Schlagwort(e): Magnetism

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Symmetric and asymmetric excitations of a strong-leg quantum spin ladder (2013)

D. Schmidiger, S. Mühlbauer, A. Zheludev, P. Bouillot, T. Giamarchi, C. Kollath, G. Ehlers, and A. M. Tsvelik

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): D. Schmidiger, S. Mühlbauer, A. Zheludev, P. Bouillot, T. Giamarchi, C. Kollath, G. Ehlers, and A. M. Tsvelik The zero-field excitation spectrum of the strong-leg spin ladder (C 7 H 10 N) 2 CuBr 4 is studied with a neutron time-of-flight technique. The spectrum is decomposed into its symmetric and asymmetric parts with respect to the rung momentum and compared with theoretical results obtained by the density matri... [Phys. Rev. B 88, 094411] Published Mon Sep 09, 2013

Schlagwort(e): Magnetism

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Thermally assisted spin-transfer torque dynamics in energy space (2013)

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

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): D. Pinna, A. D. Kent, and D. L. Stein We consider the general Landau-Lifshitz-Gilbert theory underlying the magnetization dynamics of a macrospin magnet subject to spin-torque effects and thermal fluctuations. Thermally activated dynamical properties are analyzed by averaging the full magnetization equations over constant-energy orbits.... [Phys. Rev. B 88, 104405] Published Mon Sep 09, 2013

Schlagwort(e): Magnetism

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Strong coupling theory of spin and orbital excitations in Sr_{2}IrO_{4} (2013)

Jun-ichi Igarashi and Tatsuya Nagao

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): Jun-ichi Igarashi and Tatsuya Nagao We study the low-lying excitations in 5 d transition-metal oxide Sr 2 IrO 4 on the localized electron picture. We find that Hund's coupling together with the spin-orbit interaction leads to exchange anisotropy which causes the spin wave gap. Introducing the isospin operators acting on Kramers' doublet i... [Phys. Rev. B 88, 104406] Published Mon Sep 09, 2013

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Origin and spectroscopic determination of trigonal anisotropy in a heteronuclear single-molecule magnet (2013)

L. Sorace, M.-E. Boulon, P. Totaro, A. Cornia, J. Fernandes-Soares, and R. Sessoli

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): L. Sorace, M.-E. Boulon, P. Totaro, A. Cornia, J. Fernandes-Soares, and R. Sessoli W -band (ν ≅ 94 GHz) electron paramagnetic resonance (EPR) spectroscopy was used for a single-crystal study of a star-shaped Fe 3 Cr single-molecule magnet (SMM) with crystallographically imposed trigonal symmetry. The high resolution and sensitivity accessible with W -band EPR allowed us to determine a... [Phys. Rev. B 88, 104407] Published Mon Sep 09, 2013

Schlagwort(e): Magnetism

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