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

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.

doi:10.1103/PhysRevB.99.085125

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

Journal Article · 15 February 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.99.085125 · OSTI ID:1496059

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]; Efimenko, A. ^[7]; Said, A. ^[2]; Casa, D. ^[2]; Huang, X. ^[2]; Gog, T. ^[2]; Kim, J. ^[2]; Keimer, B. ^[1]; Kim, B. J. ^[8]

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

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Research Organization:: Argonne National Laboratory (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, Journal Name: Physical Review B Journal Issue: 8 Vol. 99; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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The J _eff = 1/2 Antiferromagnet Sr ₂ IrO ₄ : A Golden Avenue toward New Physics and Functions Lu, Chengliang; Liu, Jun‐Ming Advanced Materials https://doi.org/10.1002/adma.201904508	journal	October 2019
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Isospin-phonon coupling and Fano-interference in spin-orbit Mott insulator Sr ₂ IrO ₄ Samanta, K.; Rigitano, D.; Pagliuso, P. G. Applied Physics Letters, Vol. 114, Issue 15 https://doi.org/10.1063/1.5094912	journal	April 2019
Symmetry breaking of in-plane anisotropic magnetoresistance with temperature in La-doped S r 2 Ir O 4 films Liu, M. R.; Xue, H. X.; Meng, J. C. Physical Review B, Vol. 100, Issue 7 https://doi.org/10.1103/physrevb.100.075129	journal	August 2019
First-principles calculation of spin and orbital contributions to magnetically ordered moments in Sr 2 IrO 4 Lane, Christopher; Zhang, Yubo; Furness, James W. Physical Review B, Vol. 101, Issue 15 https://doi.org/10.1103/physrevb.101.155110	journal	April 2020
The Jeff=1/2 antiferromagnet Sr2IrO4: A golden avenue toward new physics and functions Lu, Chengliang; Liu, Jun-Ming arXiv https://doi.org/10.48550/arxiv.2110.12877	text	January 2021

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