Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4

被引：46

作者：

Porras, J. ^{[1
]}

Bertinshaw, J. ^{[1
]}

Liu, H. ^{[1
]}

Khaliullin, G. ^{[1
]}

Sung, N. H. ^{[1
]}

Kim, J-W ^{[2
]}

Francoual, S. ^{[3
]}

Steffens, P. ^{[4
]}

Deng, G. ^{[5
]}

Sala, M. Moretti ^{[6
,7
]}

Efimenko, A. ^{[6
]}

Said, A. ^{[2
]}

Casa, D. ^{[2
]}

Huang, X. ^{[2
]}

Gog, T. ^{[2
]}

Kim, J. ^{[2
]}

Keimer, B. ^{[1
]}

Kim, B. J. ^{[1
,8
,9
]}

机构：

[1] Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[3] DESY, D-22603 Hamburg, Germany

[4] Inst Laue Langevin 6, Rue Jules Horowitz,Boite Postale 156, F-38042 Grenoble 9, France

[5] Australian Nucl Sci & Technol Org, Lucas Height, NSW 2233, Australia

[6] European Synchrotron Radiat Facil, Boite Postale 220, F-38043 Grenoble, France

[7] Politecn Milan, Dipartimento Fis, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy

[8] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea

[9] Ctr Artificial Low Dimens Elect Syst, Inst Basic Sci, 77 Cheongam Ro, Pohang 790784, South Korea

来源：

PHYSICAL REVIEW B | 2019年 / 99卷 / 08期

关键词：

EXCHANGE;

D O I：

10.1103/PhysRevB.99.085125

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Spin-orbit entangled magnetic dipoles, often referred to as pseudospins, provide a new avenue to explore novel magnetism inconceivable in the weak spin-orbit coupling limit, but the nature of their low-energy interactions remains to be understood. We present a comprehensive study of the static magnetism and low-energy pseudospin dynamics in the archetypal spin-orbit Mott insulator Sr2IrO4. We find that in order to understand even basic magnetization measurements, a formerly overlooked in-plane anisotropy is fundamental. In addition to magnetometry, we use neutron diffraction, inelastic neutron scattering, and resonant elastic and inelastic x-ray scattering to identify and quantify the interactions that determine the global symmetry of the system and govern the linear responses of pseudospins to external magnetic fields and their low-energy dynamics. We find that a pseudospin-only Hamiltonian is insufficient for an accurate description of the magnetism in Sr2IrO4 and that pseudospin-lattice coupling is essential. This finding should be generally applicable to other pseudospin systems with sizable orbital moments sensitive to anisotropic crystalline environments.

引用

页数：11

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