De Silva, TN , Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA.
部门归属:
Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA; Univ Ruhuna, Dept Phys, Matara, Sri Lanka; Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA; Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要:
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.
