Theory for spin and orbital orderings in high temperature phase in $YVO_3$

Details Theory for spin and orbital orderings in high temperature phase in $YVO_3$ Theory for spin and orbital orderings in high temperature phase in $YVO_3$

2003-02-24

arxiv.org/abs/cond-mat/0302489v2

Phys. Rev. B 68, 184402 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 3 figures and 2 tables. Accepted to be published in PRB

Scientific paper

10.1103/PhysRevB.68.184402

Motivated by the recent neutron diffraction experiment on $YVO_3$, we consider a microscopic model where each $V^{3+}$ ion is occupied by two 3d electrons of parallel spins with two fold 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 $\sim 200K$ and the spin phase transition at $\sim 114K$ in $YVO_3$.

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