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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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Beyond-mean-field behavior of large Bose-Einstein condensates in double-well potentials (2013)

Bettina Gertjerenken and Christoph Weiss

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-07

Beschreibung: Author(s): Bettina Gertjerenken and Christoph Weiss For the dynamics of Bose-Einstein condensates (BECs), differences between mean-field (Gross-Pitaevskii) physics and N -particle quantum physics often disappear if the BEC becomes larger and larger. In particular, the time scale for which both dynamics agree should thus become larger if the particle n... [Phys. Rev. A 88, 033608] Published Fri Sep 06, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Thermodynamics of strongly correlated one-dimensional Bose gases (2013)

Andreas Vogler, Ralf Labouvie, Felix Stubenrauch, Giovanni Barontini, Vera Guarrera, and Herwig Ott

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-12

Beschreibung: Author(s): Andreas Vogler, Ralf Labouvie, Felix Stubenrauch, Giovanni Barontini, Vera Guarrera, and Herwig Ott We investigate the thermodynamics of one-dimensional (1D) Bose gases in the strongly correlated regime. To this end, we prepare ensembles of independent 1D Bose gases in a two-dimensional optical lattice and perform high-resolution in situ imaging of the column-integrated density distribution. Using... [Phys. Rev. A 88, 031603] Published Wed Sep 11, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Large quantum superpositions of a levitated nanodiamond through spin-optomechanical coupling (2013)

Zhang-qi Yin, Tongcang Li, Xiang Zhang, and L. M. Duan

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-12

Beschreibung: Author(s): Zhang-qi Yin, Tongcang Li, Xiang Zhang, and L. M. Duan We propose a method to generate and detect large quantum superposition states and arbitrary Fock states for the oscillational mode of an optically levitated nanocrystal diamond. The nonlinear interaction required for the generation of non-Gaussian quantum states is enabled through the spin-mechanica... [Phys. Rev. A 88, 033614] Published Wed Sep 11, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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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Postadiabatic Hamiltonian for low-energy excitations in a slowly-time-dependent BCS-BEC crossover (2013)

Bernhard M. Breid and James R. Anglin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): Bernhard M. Breid and James R. Anglin We develop a Hamiltonian that describes the time-dependent formation of a molecular Bose-Einstein condensate from a Bardeen-Cooper-Schrieffer state of fermionic atoms as a result of slowly sweeping through a Feshbach resonance. In contrast to many other calculations in the field, our Hamiltonian inc... [Phys. Rev. A 88, 033617] Published Mon Sep 16, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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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Correlation lengths of the repulsive one-dimensional Bose gas (2013)

Ovidiu I. Pâţu and Andreas Klümper

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): Ovidiu I. Pâţu and Andreas Klümper We investigate the large-distance asymptotic behavior of the static density-density and field-field correlation functions in the one-dimensional Bose gas at finite temperature. The asymptotic expansions of the Bose gas correlators are obtained performing a specific continuum limit in the similar low... [Phys. Rev. A 88, 033623] Published Thu Sep 19, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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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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

Schlagwort(e): Magnetism

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Tight-binding model for exciton-polariton condensates in external potentials (2013)

Piotr Stępnicki and Michał Matuszewski

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Piotr Stępnicki and Michał Matuszewski We propose a mean-field model to describe exciton-polariton condensates in deep periodic external potentials. We derive a set of coupled discrete equations for both condensed and uncondensed components, with interaction and tunneling coefficients obtained within the tight-binding approximation. We u... [Phys. Rev. A 88, 033626] Published Mon Sep 23, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Zero sound in a two-dimensional dipolar Fermi gas (2013)

Zhen-Kai Lu, S. I. Matveenko, and G. V. Shlyapnikov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Zhen-Kai Lu, S. I. Matveenko, and G. V. Shlyapnikov We study zero sound in a weakly interacting two-dimensional (2D) gas of single-component fermionic dipoles (polar molecules or atoms with a large magnetic moment) tilted with respect to the plane of their translational motion. It is shown that the propagation of zero sound is provided by both mean-f... [Phys. Rev. A 88, 033625] Published Mon Sep 23, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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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Demixing in symmetric supersolid mixtures (2013)

Piyush Jain, Saverio Moroni, Massimo Boninsegni, and Lode Pollet

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): Piyush Jain, Saverio Moroni, Massimo Boninsegni, and Lode Pollet The droplet crystal phase of a symmetric binary mixture of soft-core bosons is studied by computer simulation. At high temperature each droplet comprises on average equal numbers of particles of either component, but the two components demix below the supersolid transition temperature, i.e., droplet... [Phys. Rev. A 88, 033628] 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

Schlagwort(e): Magnetism

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Classification of spin-nematic squeezing in spin-1 collective atomic systems (2013)

Emi Yukawa, Masahito Ueda, and Kae Nemoto

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): Emi Yukawa, Masahito Ueda, and Kae Nemoto In spin-1 collective atomic systems, the spin and nematic-tensor operators constitute the su(3) Lie algebra, whose su(2) subalgebras are shown to give two distinct classes of squeezing which are unitarily equivalent to spin squeezing and spin-nematic squeezing. We explicitly construct a unitary oper... [Phys. Rev. A 88, 033629] 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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Transverse spin diffusion in strongly interacting Fermi gases (2013)

Tilman Enss

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-28

Beschreibung: Author(s): Tilman Enss We compute spin diffusion in a dilute Fermi gas at arbitrary temperature, polarization, and strong interaction in the normal phase using kinetic theory. While the longitudinal spin diffusivity D ∥ depends weakly on polarization and diverges for small temperatures, the transverse spin diffusivity D ⊥ h... [Phys. Rev. A 88, 033630] Published Fri Sep 27, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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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Self-consistent tight-binding description of Dirac points moving and merging in two-dimensional optical lattices (2013)

Julen Ibañez-Azpiroz, Asier Eiguren, Aitor Bergara, Giulio Pettini, and Michele Modugno

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Julen Ibañez-Azpiroz, Asier Eiguren, Aitor Bergara, Giulio Pettini, and Michele Modugno We present an accurate ab initio tight-binding model, capable of describing the dynamics of Dirac points in tunable honeycomb optical lattices following a recent experimental realization [ Tarruell et al. Nature (London) 483 302 (2012) ]. Our scheme is based on first-principle maximally localized Wa... [Phys. Rev. A 88, 033631] Published Mon Sep 30, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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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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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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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Collective modes in the anisotropic unitary Fermi gas and the inclusion of a backflow term (2013)

L. Salasnich, P. Comaron, M. Zambon, and F. Toigo

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): L. Salasnich, P. Comaron, M. Zambon, and F. Toigo We study the collective modes of the confined unitary Fermi gas under anisotropic harmonic confinement as a function of the number of atoms. We use the equations of extended superfluid hydrodynamics, which take into account a dispersive von Weizsäcker-like term [ C. F. von Weizsäcker Z. Phys. 96 43... [Phys. Rev. A 88, 033610] Published Mon Sep 09, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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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Landau levels in lattices with long-range hopping (2013)

Hakan Atakişi and M. Ö. Oktel

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): Hakan Atakişi and M. Ö. Oktel Landau levels (LLs) are broadened in the presence of a periodic potential, forming a barrier for accurate simulation of the fractional quantum Hall effect using cold atoms in optical lattices. Recently, it has been shown that the degeneracy of the lowest Landau level (LLL) can be restored in a tight... [Phys. Rev. A 88, 033612] Published Tue Sep 10, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Backscattering echo of correlated wave packets (2013)

Nicolas Cherroret and Dominique Delande

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Nicolas Cherroret and Dominique Delande We present an analytical theory describing a phenomenon of enhanced backscattering corresponding to the spatial refocussing of a spreadout correlated wave packet due to a brief interaction with a disordered potential. Our theory is validated by numerical simulations and explains the physics observed... [Phys. Rev. A 88, 035602] Published Thu Sep 12, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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

Schlagwort(e): Magnetism

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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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Roton-assisted chiral p-wave superfluid in a quasi-two-dimensional dipolar Bose-Fermi quantum-gas mixture (2013)

Ben Kain and Hong Y. Ling

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): Ben Kain and Hong Y. Ling The chiral p -wave ( p x ± i p y ) superfluid has attracted significant attention in recent years, mainly because its vortex core supports a Majorana fermion which, due to its non-Abelian statistics, can be explored for implementing topological quantum computation. Mixing dipolar bosons with fermions in qua... [Phys. Rev. A 88, 033616] Published Mon Sep 16, 2013

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Supersolid structure and excitation spectrum of soft-core bosons in three dimensions (2013)

Francesco Ancilotto, Maurizio Rossi, and Flavio Toigo

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): Francesco Ancilotto, Maurizio Rossi, and Flavio Toigo By means of a mean-field method, we have studied the zero-temperature structure and excitation spectrum of a three-dimensional soft-core bosonic system for a value of the interaction strength that favors a crystal structure made of atomic nanoclusters arranged with fcc ordering. In addition to the l... [Phys. Rev. A 88, 033618] 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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Momentum-dependent s-wave and d-wave interactions in atomic Bose-Einstein condensates (2013)

Moumita Gupta and Krishna Rai Dastidar

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Moumita Gupta and Krishna Rai Dastidar We investigate the role of momentum-dependent interactions to determine the ground-state properties in the Bose-Einstein condensate for large scattering lengths ( a ) such that k a ≥1, even for small momentum ( p ) where p = ℏ k and k is the wave number. The results for momentum-dependent and momentum-indep... [Phys. Rev. A 88, 033619] 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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Excitation spectrum of a toroidal spin-1 Bose-Einstein condensate (2013)

H. Mäkelä and E. Lundh

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): H. Mäkelä and E. Lundh We calculate analytically the Bogoliubov excitation spectrum of a toroidal spin-1 Bose-Einstein condensate that is subjected to a homogeneous magnetic field and contains vortices with arbitrary winding numbers in the m F =±1 components of the hyperfine spin. We show that a rotonlike spectrum can be ob... [Phys. Rev. A 88, 033622] Published Thu Sep 19, 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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First-order phase transition and anomalous hysteresis of Bose gases in optical lattices (2013)

Daisuke Yamamoto, Takeshi Ozaki, Carlos A. R. Sá de Melo, and Ippei Danshita

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Daisuke Yamamoto, Takeshi Ozaki, Carlos A. R. Sá de Melo, and Ippei Danshita We study the first-order quantum phase transitions of Bose gases in optical lattices. A special emphasis is placed on an anomalous hysteresis behavior, in which the phase transition occurs in a unidirectional way and a hysteresis loop does not form. We first revisit the hardcore Bose-Hubbard model w... [Phys. Rev. A 88, 033624] Published Fri Sep 20, 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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Absence of damping of low-energy excitations in a quasi-two-dimensional dipolar Bose gas (2013)

Stefan S. Natu and S. Das Sarma

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Stefan S. Natu and S. Das Sarma We develop a theory of damping of low-energy, collective excitations in a quasi-two-dimensional, homogenous, dipolar Bose gas at zero temperature, via processes whereby an excitation decays into two excitations with lower energy. We find that owing to the nature of the low-energy spectrum of a quasi... [Phys. Rev. A 88, 031604] Published Wed Sep 25, 2013

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Compact atomic gravimeter based on a pulsed and accelerated optical lattice (2013)

Manuel Andia, Raphaël Jannin, François Nez, François Biraben, Saïda Guellati-Khélifa, and Pierre Cladé

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Manuel Andia, Raphaël Jannin, François Nez, François Biraben, Saïda Guellati-Khélifa, and Pierre Cladé We present a scheme of a compact atomic gravimeter based on atom interferometry. Atoms are maintained against gravity using a sequence of coherent accelerations performed by the Bloch oscillations technique. We demonstrate a sensitivity of 4.8×10 −8 with an integration time of 4 min. Combining this m... [Phys. Rev. A 88, 031605] Published Wed Sep 25, 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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Self-trapping in the two-dimensional Bose-Hubbard model (2013)

Andrew Jreissaty, Juan Carrasquilla, and Marcos Rigol

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Andrew Jreissaty, Juan Carrasquilla, and Marcos Rigol We study the expansion of harmonically trapped bosons in a two-dimensional lattice after suddenly turning off the confining potential. We show that, in the presence of multiple occupancies per lattice site and strong interactions, the system exhibits a clear dynamical separation into slowly and rapi... [Phys. Rev. A 88, 031606] Published Mon Sep 30, 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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Quantum breathing dynamics of ultracold bosons in one-dimensional harmonic traps: Unraveling the pathway from few- to many-body systems (2013)

Rüdiger Schmitz, Sven Krönke, Lushuai Cao, and Peter Schmelcher

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Rüdiger Schmitz, Sven Krönke, Lushuai Cao, and Peter Schmelcher Following a “bottom-up approach” in understanding many-particle effects and dynamics we provide a systematic ab initio study of the dependence of the breathing dynamics of ultracold bosons in a one-dimensional (1D) harmonic trap on the number of bosons ranging from few to many. To this end, we emplo... [Phys. Rev. A 88, 043601] Published Wed Oct 02, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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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Distortion of interference fringes and the resulting vortex production of merging Bose-Einstein condensates (2013)

Bo Xiong, Tao Yang, and Keith A. Benedict

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-04

Beschreibung: Author(s): Bo Xiong, Tao Yang, and Keith A. Benedict We investigate the effects of interatomic interactions and expansion on the distortion of interference fringes of a pair of initially well-separated, but coherent, condensate clouds trapped in a harmonic trap. The distortion of interference fringes, which can lead to the spontaneous formation of vor... [Phys. Rev. A 88, 043602] Published Thu Oct 03, 2013

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Stability and collapse of fermions in a binary dipolar boson-fermion ^{164}Dy-^{161}Dy mixture (2013)

S. K. Adhikari

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-04

Beschreibung: Author(s): S. K. Adhikari We suggest a time-dependent mean-field hydrodynamic model for a binary dipolar boson-fermion mixture to study the stability and collapse of fermions in the 164 Dy- 161 Dy mixture. The condition of stability of the dipolar mixture is illustrated in terms of phase diagrams. A collapse is induced in a dis... [Phys. Rev. A 88, 043603] Published Thu Oct 03, 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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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

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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

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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

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Ground state of a two-component dipolar Fermi gas in a harmonic potential (2013)

Przemyslaw Bienias, Krzysztof Pawłowski, Tilman Pfau, and Kazimierz Rzążewski

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): Przemyslaw Bienias, Krzysztof Pawłowski, Tilman Pfau, and Kazimierz Rzążewski Interacting two-component Fermi gases are at the heart of our understanding of macroscopic quantum phenomena such as superconductivity. The changing nature of the interaction is expected to head to novel quantum phases. Here we study the ground state of a two-component fermionic gas in a harmonic po... [Phys. Rev. A 88, 043604] Published Fri Oct 04, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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

Schlagwort(e): Magnetism

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Mesoscopic dipolar quantum crystals (2013)

Massimo Boninsegni

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Massimo Boninsegni The ground state of a two-dimensional, harmonically confined mesoscopic assembly of up to 30 polar molecules is studied by computer simulations. As the strength of the confining trap is increased, clusters evolve from superfluid, to supersolid, to insulating crystals. For strong confinement, the cry... [Phys. Rev. A 87, 063604] Published Wed Jun 05, 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

Schlagwort(e): Magnetism

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Elementary excitations of ultracold soft-core bosons across the superfluid-supersolid phase transition (2013)

T. Macrì, F. Maucher, F. Cinti, and T. Pohl

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-06-12

Beschreibung: Author(s): T. Macrì, F. Maucher, F. Cinti, and T. Pohl We investigate the zero-temperature excitation spectrum of two-dimensional soft-core bosons for a wide range of parameters and across the phase transition from a superfluid to a supersolid state. Based on mean-field calculations and recent quantum Monte Carlo results, we demonstrate the applicabilit... [Phys. Rev. A 87, 061602] Published Tue Jun 11, 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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Exotic pairing states in a Fermi gas with three-dimensional spin-orbit coupling (2013)

Xiang-Fa Zhou, Guang-Can Guo, Wei Zhang, and Wei Yi

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-06-07

Beschreibung: Author(s): Xiang-Fa Zhou, Guang-Can Guo, Wei Zhang, and Wei Yi We investigate properties of exotic pairing states in a three-dimensional Fermi gas with three-dimensional spin-orbit coupling and an effective Zeeman field. The interplay of spin-orbit coupling, effective Zeeman field, and pairing can lead to first-order phase transitions between different phases, ... [Phys. Rev. A 87, 063606] Published Thu Jun 06, 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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Orbital coupled dipolar fermions in an asymmetric optical ladder (2013)

Xiaopeng Li and W. Vincent Liu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Xiaopeng Li and W. Vincent Liu We study a quantum ladder of interacting fermions with coupled s and p orbitals. Such a model describes dipolar molecules or atoms loaded into a double-well optical lattice, dipole moments being aligned by an external field. The two orbital components have distinct hoppings. The tunneling between th... [Phys. Rev. A 87, 063605] Published Wed Jun 05, 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

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

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Small two-component Fermi gases in a cubic box with periodic boundary conditions (2013)

X. Y. Yin and D. Blume

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): X. Y. Yin and D. Blume The properties of two-component Fermi gases become universal if the interspecies s -wave scattering length a s and the average interparticle spacing are much larger than the range of the underlying two-body potential. Using an explicitly correlated Gaussian basis set expansion approach, we determine t... [Phys. Rev. A 87, 063609] Published Mon Jun 10, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

Print ISSN: 1050-2947

Digitale ISSN: 1094-1622

Thema: Physik

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Emergence of spatially extended pair coherence through incoherent local environmental coupling (2013)

Jean-Sébastien Bernier, Peter Barmettler, Dario Poletti, and Corinna Kollath

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): Jean-Sébastien Bernier, Peter Barmettler, Dario Poletti, and Corinna Kollath We demonstrate that quantum coherence can be generated by the interplay of coupling to an incoherent environment and kinetic processes. This joint effect even occurs in a repulsively interacting fermionic system initially prepared in an incoherent Mott insulating state. In this case, coupling a diss... [Phys. Rev. A 87, 063608] Published Mon Jun 10, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Thema: Physik

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Phase diagram of quasi-two-dimensional bosons in a laser-speckle potential (2013)

G. E. Astrakharchik, K. V. Krutitsky, and P. Navez

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-06-11

Beschreibung: Author(s): G. E. Astrakharchik, K. V. Krutitsky, and P. Navez We have studied the phase diagram of a quasi-two-dimensional interacting Bose gas at zero temperature in the presence of random potential created by laser speckles. The superfluid fraction and the fraction of particles with zero momentum are obtained within the mean-field Gross-Pitaevskii theory and... [Phys. Rev. A 87, 061601] Published Mon Jun 10, 2013

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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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

Schlagwort(e): Magnetism

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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

Schlagwort(e): Magnetism

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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

Schlagwort(e): Magnetism

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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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