Suppression of effective spin-orbit coupling by thermal fluctuations in spin-orbit coupled antiferromagnets

被引:5
|
作者
Lotze, Jan [1 ]
Daghofer, Maria [1 ,2 ]
机构
[1] Univ Stuttgart, Inst Funkt Mat & Quantentechnol, D-70550 Stuttgart, Germany
[2] Univ Stuttgart, Ctr Integrated Quantum Sci & Technol, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
关键词
CRYSTAL; CA2RUO4;
D O I
10.1103/PhysRevB.104.045125
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 t(2g) subshell. We focus on parameters suitable for antiferromagnetic Mott insulators, in particular, Ca2RuO4, 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 xz and yz 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 on-site 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 T approximate to 260 K, as the signature of the onset of spin-orbital correlations.
引用
收藏
页数:9
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