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Title: Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr 2 IrO 4

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. In this paper, we present a comprehensive study of the static magnetism and low-energy pseudospin dynamics in the archetypal spin-orbit Mott insulator Sr 2IrO 4. 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 Sr 2IrO 4 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

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [6];  [7];  [2];  [2];  [2];  [2];  [2];  [1];  [8]
  1. Max-Planck-Institut für Festkörperforschung, Stuttgart (Germany)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  4. Institut Laue-Langevin 6, rue Jules Horowitz (France)
  5. Australian Nuclear Science and Technology Organization, Lucas Height, New South Wales (Australia)
  6. European Synchrotron Radiation Facility (France); Politecnico di Milano, Piazza Leonardo da Vinci, Milano (Italy)
  7. European Synchrotron Radiation Facility (France)
  8. Max-Planck-Institut für Festkörperforschung, Stuttgart (Germany); Pohang University of Science and Technology (South Korea); Institute for Basic Science (South Korea)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Institute for Basic Science
OSTI Identifier:
1496059
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 8; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Porras, J., Bertinshaw, J., Liu, H., Khaliullin, G., Sung, N. H., Kim, J. -W., Francoual, S., Steffens, P., Deng, G., Sala, M. Moretti, Efimenko, A., Said, A., Casa, D., Huang, X., Gog, T., Kim, J., Keimer, B., and Kim, B. J. Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.085125.
Porras, J., Bertinshaw, J., Liu, H., Khaliullin, G., Sung, N. H., Kim, J. -W., Francoual, S., Steffens, P., Deng, G., Sala, M. Moretti, Efimenko, A., Said, A., Casa, D., Huang, X., Gog, T., Kim, J., Keimer, B., & Kim, B. J. Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4. United States. doi:10.1103/PhysRevB.99.085125.
Porras, J., Bertinshaw, J., Liu, H., Khaliullin, G., Sung, N. H., Kim, J. -W., Francoual, S., Steffens, P., Deng, G., Sala, M. Moretti, Efimenko, A., Said, A., Casa, D., Huang, X., Gog, T., Kim, J., Keimer, B., and Kim, B. J. Fri . "Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4". United States. doi:10.1103/PhysRevB.99.085125.
@article{osti_1496059,
title = {Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4},
author = {Porras, J. and Bertinshaw, J. and Liu, H. and Khaliullin, G. and Sung, N. H. and Kim, J. -W. and Francoual, S. and Steffens, P. and Deng, G. and Sala, M. Moretti and Efimenko, A. and Said, A. and Casa, D. and Huang, X. and Gog, T. and Kim, J. and Keimer, B. and Kim, B. J.},
abstractNote = {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},
doi = {10.1103/PhysRevB.99.085125},
journal = {Physical Review B},
number = 8,
volume = 99,
place = {United States},
year = {2019},
month = {2}
}

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This content will become publicly available on February 15, 2020
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