Pseudospin-lattice coupling in the spin-orbit Mott insulator
- Max-Planck-Institut für Festkörperforschung, Stuttgart (Germany)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- Institut Laue-Langevin 6, rue Jules Horowitz (France)
- Australian Nuclear Science and Technology Organization, Lucas Height, New South Wales (Australia)
- European Synchrotron Radiation Facility (France); Politecnico di Milano, Piazza Leonardo da Vinci, Milano (Italy)
- European Synchrotron Radiation Facility (France)
- Max-Planck-Institut für Festkörperforschung, Stuttgart (Germany); Pohang University of Science and Technology (South Korea); Institute for Basic Science (South Korea)
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. In this paper, 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. In conclusion, this finding should be generally applicable to other pseudospin systems with sizable orbital moments sensitive to anisotropic crystalline environment
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Institute for Basic Science
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1496059
- Journal Information:
- Physical Review B, Vol. 99, Issue 8; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
The J eff = 1/2 Antiferromagnet Sr 2 IrO 4 : A Golden Avenue toward New Physics and Functions
|
journal | October 2019 |
Giant anisotropic magnetoresistance and nonvolatile memory in canted antiferromagnet Sr2IrO4
|
journal | May 2019 |
Isospin-phonon coupling and Fano-interference in spin-orbit Mott insulator Sr 2 IrO 4
|
journal | April 2019 |
Symmetry breaking of in-plane anisotropic magnetoresistance with temperature in La-doped films
|
journal | August 2019 |
The Jeff=1/2 antiferromagnet Sr2IrO4: A golden avenue toward new physics and functions | text | January 2021 |
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