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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-08-13

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

Keywords: Magnetism

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Electronic ISSN: 1095-3795

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Strong enhancement of spin ordering by A-site magnetic ions in the ferrimagnet CaCu_{3} Fe_{2} Os_{2} O_{12} (2016)

Hongshan Deng, Min Liu, Jianhong Dai, Zhiwei Hu, Changyang Kuo, Yunyu Yin, Junye Yang, Xiao Wang, Qing Zhao, Yuanji Xu, Zhaoming Fu, Jianwang Cai, Haizhong Guo, Kuijuan Jin, Tunwen Pi, Yunliang Soo, Guanghui Zhou, Jinguang Cheng, Kai Chen, Philippe Ohresser, Yi-feng Yang, Changqing Jin, Liu-Hao Tjeng, and Youwen Long

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-13

Description: Author(s): Hongshan Deng, Min Liu, Jianhong Dai, Zhiwei Hu, Changyang Kuo, Yunyu Yin, Junye Yang, Xiao Wang, Qing Zhao, Yuanji Xu, Zhaoming Fu, Jianwang Cai, Haizhong Guo, Kuijuan Jin, Tunwen Pi, Yunliang Soo, Guanghui Zhou, Jinguang Cheng, Kai Chen, Philippe Ohresser, Yi-feng Yang, Changqing Jin, Liu-Hao Tjeng, and Youwen Long A B O 3 perovskite is a kind of very important functional material with versatile physical properties. Although B -site chemical substitution with various magnetic ions has been widely investigated, the A -site doping with magnetic transition metal is little known. Here we report A A 3 ′ B 2 B 2 ′ O 12 -type A - and… [Phys. Rev. B 94, 024414] Published Tue Jul 12, 2016

Keywords: Magnetism

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Spin-orbit torques and spin accumulation in FePt/Pt and Co/Cu thin films from first principles: The role of impurities (2016)

Guillaume Géranton, Bernd Zimmermann, Nguyen H. Long, Phivos Mavropoulos, Stefan Blügel, Frank Freimuth, and Yuriy Mokrousov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-22

Description: Author(s): Guillaume Géranton, Bernd Zimmermann, Nguyen H. Long, Phivos Mavropoulos, Stefan Blügel, Frank Freimuth, and Yuriy Mokrousov Using the Boltzmann formalism based on the first principles electronic structure and scattering rates, we investigate the current-induced spin accumulation and spin-orbit torques in FePt/Pt and Co/Cu bilayers in the presence of substitutional impurities. In FePt/Pt bilayers we consider the effect of… [Phys. Rev. B 93, 224420] Published Tue Jun 21, 2016

Keywords: Magnetism

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Fermi surfaces, spin-mixing parameter, and colossal anisotropy of spin relaxation in transition metals from ab initio theory (2016)

Bernd Zimmermann, Phivos Mavropoulos, Nguyen H. Long, Christian-Roman Gerhorst, Stefan Blügel, and Yuriy Mokrousov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-04-05

Description: Author(s): Bernd Zimmermann, Phivos Mavropoulos, Nguyen H. Long, Christian-Roman Gerhorst, Stefan Blügel, and Yuriy Mokrousov The Fermi surfaces and Elliott-Yafet spin-mixing parameter (EYP) of several elemental metals are studied by ab initio calculations. We focus first on the anisotropy of the EYP as a function of the direction of the spin-quantization axis [B. Zimmermann et al. , Phys. Rev. Lett. 109 , 236603 (2012) ]. W… [Phys. Rev. B 93, 144403] Published Mon Apr 04, 2016

Keywords: Magnetism

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Influence of complex disorder on skew-scattering Hall effects in L1_{0} -ordered FePt alloy (2016)

Bernd Zimmermann, Nguyen H. Long, Phivos Mavropoulos, Stefan Blügel, and Yuriy Mokrousov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-08-12

Description: Author(s): Bernd Zimmermann, Nguyen H. Long, Phivos Mavropoulos, Stefan Blügel, and Yuriy Mokrousov One of the key mechanisms for transverse spin-current generation in metals is the electron skew scattering off defects and impurities, where the spin-orbit interaction leads to an effective deflection of the electrons away from the direction of an applied electric field. Recently, there has been an intensive interest in the skew-scattering part of the Hall effects in an important spintronics material, L 1 0 -ordered FePt alloy, where conflicting data with regard to the skew-scattering magnitude have been reported in previous studies. To understand the reason for this controversy, the authors considered various sources of scattering in FePt and determined the skew scattering Hall angles from microscopic density functional theory calculations and Boltzmann transport theory. Based on their results, the authors are able to explain the extreme spread of available data for FePt with drastic dependence of the skew-scattering properties on the details of disorder. [Phys. Rev. B 94, 060406(R)] Published Thu Aug 11, 2016

Keywords: Magnetism

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Quantum phase transitions in a generalized compass chain with three-site interactions (2016)

Wen-Long You, Yu-Cheng Qiu, and Andrzej M. Oleś

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-06-16

Description: Author(s): Wen-Long You, Yu-Cheng Qiu, and Andrzej M. Oleś We consider a class of one-dimensional compass models with an XYZ-YZX type of three-site exchange interaction in an external magnetic field. We present the exact solution derived by means of Jordan-Wigner transformation, and study the excitation gap, spin correlations, and establish the phase diagra… [Phys. Rev. B 93, 214417] Published Wed Jun 15, 2016

Keywords: Magnetism

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Ferromagnetic domain behavior and phase transition in bilayer manganites investigated at the nanoscale (2015)

C. Phatak, A. K. Petford-Long, H. Zheng, J. F. Mitchell, S. Rosenkranz, and M. R. Norman

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-12-17

Description: Author(s): C. Phatak, A. K. Petford-Long, H. Zheng, J. F. Mitchell, S. Rosenkranz, and M. R. Norman Understanding the underlying mechanism and phenomenology of colossal magnetoresistance in manganites has largely focused on atomic and nanoscale physics such as double exchange, phase separation, and charge order. Here we consider a more macroscopic view of manganite materials physics, reporting on … [Phys. Rev. B 92, 224418] Published Mon Dec 14, 2015

Keywords: Magnetism

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Evolution of magnetic phases in single crystals of SrFe_{1−x}Co_{x}O_{3} solid solution (2012)

Y. W. Long, Y. Kaneko, S. Ishiwata, Y. Tokunaga, T. Matsuda, H. Wadati, Y. Tanaka, S. Shin, Y. Tokura, and Y. Taguchi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-08-28

Description: Author(s): Y. W. Long, Y. Kaneko, S. Ishiwata, Y. Tokunaga, T. Matsuda, H. Wadati, Y. Tanaka, S. Shin, Y. Tokura, and Y. Taguchi Single crystals of SrFe 1− x Co x O 3 solid solution with high valence ions (Fe 4+ /Co 4+ ) were synthesized by combining floating-zone and high-pressure oxygen-annealing techniques. As the Co content ( x ) is increased, the ground state changes from the helimagnetic state ( x ≤ 0.05) through cluster glass to th... [Phys. Rev. B 86, 064436] Published Mon Aug 27, 2012

Keywords: Magnetism

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von Neumann entropy spectra and entangled excitations in spin-orbital models (2012)

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-09-11

Description: Author(s): Wen-Long You, Andrzej M. Oleś, and Peter Horsch We consider the low-energy excitations of one-dimensional spin-orbital models which consist of spin waves, orbital waves, and joint spin-orbital excitations. Among the latter we identify strongly entangled spin-orbital bound states and spin-orbital quasiparticle states which appear as peaks in the v... [Phys. Rev. B 86, 094412] Published Mon Sep 10, 2012

Keywords: Magnetism

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Fidelity susceptibility in two-dimensional spin-orbit models (2011)

Wen-Long You and Yu-Li Dong

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-11-22

Description: Author(s): Wen-Long You and Yu-Li Dong [Phys. Rev. B 84, 174426] Published Mon Nov 21, 2011

Keywords: Magnetism

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