Effect of spin-orbit coupling on the effective-spin correlation in YbMgGaO4

  • Motivated by the recent experiments on the triangular lattice spin-liquid candidate YbMgGaO4, we explore the effect of spin-orbit coupling on the effective-spin correlation of the Yb local moments. We point out that the anisotropic interaction between the effective spins on the nearest-neighbor bonds is sufficient to reproduce the spin-wave dispersion of the fully polarized state in the presence of strong magnetic field normal to the triangular plane. We further evaluate the effective-spin correlation at zero magnetic field within the mean-field spherical approximation. We explicitly demonstrate that the nearest-neighbor anisotropic effective-spin interaction, originating from the strong spin-orbit coupling, enhances the effective-spin correlation at the M points in the Brillouin zone. We identify these results as strong evidence for the anisotropic interaction and strong spin-orbit coupling in YbMgGaO4.

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Metadaten
Author:Yao-Dong Li, Yao Shen, Yuesheng Li, Jun Zhao, Gang Chen
Frontdoor URLhttps://opus.bibliothek.uni-augsburg.de/opus4/102371
ISSN:2469-9950OPAC
ISSN:2469-9969OPAC
Parent Title (English):Physical Review B
Publisher:American Physical Society (APS)
Place of publication:College Park, MD
Type:Article
Language:English
Year of first Publication:2018
Release Date:2023/02/28
Volume:97
Issue:12
First Page:125105
DOI:https://doi.org/10.1103/physrevb.97.125105
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Experimentalphysik VI