Theory for spin and orbital orderings in high-temperature phases in YVO3

[摘要] Motivated by the recent neutron-diffraction experiment on YVO3, we consider a microscopic model where each V3+ ion is occupied by two 3d electrons of parallel spins with twofold-degenerate orbital configurations. The mean-field classical solutions of the spin-orbital superexchange model predicts an antiferro-orbital ordering at a higher temperature followed by a C-type antiferromagnetic spin ordering at a lower temperature. Our results are qualitatively consistent with the observed orbital phase transition at similar to200 K and the spin phase transition at similar to114 K in YVO3.

[发布日期] 2003-11-01

[关键词] TRANSITION-METAL OXIDES;MAGNETIC-PROPERTIES;INSULATING V2O3;MOTT-INSULATOR;LAVO3;SUSCEPTIBILITY;EXCHANGE;BEHAVIOR