Suppression of effective spin-orbit coupling by thermal fluctuations in spin-orbit coupled antiferromagnets
arXiv:2102.05489 · doi:10.1103/PhysRevB.104.045125
Abstract
We apply the finite-temperature variational cluster approach to a strongly correlated and spin-orbit coupled model for four electrons (i.e. two holes) in the subshell. We focus on parameters suitable for antiferromagnetic Mott insulators, in particular CaRuO, and identify a crossover from the low-temperature regime, where spin-orbit coupling is essential, to the high-temperature regime where it leaves few signatures. The crossover is seen in one-particle spectra, where and spectra are almost one dimensional (as expected for weak spin-orbit coupling) at high temperature. At lower temperature, where spin-orbit coupling mixes all three orbitals, they become more two dimensional. However, stronger effects are seen in two-particle observables like the weight in states with definite onsite angular momentum. We thus identify the enigmatic intermediate-temperature 'orbital-order phase transition', which has been reported in various X-ray diffraction and absorption experiments at , as the signature of the onset of spin-orbital correlations.
arXiv comment8 pages, 7 figures
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