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

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Title
Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4
Author(s)
Porras, J; Bertinshaw, J; Liu, H; Khaliullin, G; Sung, NH; Kim, JW; Francoual, S; Steffens, P; Deng, G; Sala, MM; Efimenko, A; Said, A; Casa, D; Huang, X; Gog, T; Kim, J; Keimer, B; B. J. Kim
Publication Date
2019-02
Journal
PHYSICAL REVIEW B, v.99, no.8, pp.085125 -
Publisher
AMER PHYSICAL SOC
Abstract
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. ©2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6029
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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