Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4
| Autor: | Porras, J., Bertinshaw, J., Liu, H., Khaliullin, G., Sung, N. H., Kim, J. -W., Francoual, S., Steffens, P., Deng, G., Sala, M. Moretti, Effimenko, A., Said, A., Casa, D., Huang, X., Gog, T., Kim, J., Keimer, B., Kim, B. J. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 99, 085125 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.99.085125 |
| Popis: | 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 felds 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. Comment: Main text:11 pages, 12 figures Supplementary Material: 3 pages, 2 figures, 1 table |
| Databáze: | arXiv |
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