Dimerization versus Orbital Moment Ordering in the Mott insulator YVO$_3$

Details Dimerization versus Orbital Moment Ordering in the Mott insulator YVO$_3$ Dimerization versus Orbital Moment Ordering in the Mott insulator YVO$_3$

2003-06-25

arxiv.org/abs/cond-mat/0306637v1

Phys. Rev. Lett. 91, 257203 (2003).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, Revtex

Scientific paper

10.1103/PhysRevLett.91.257203

We use exact diagonalization combined with mean-field theory to investigate the phase diagram of the spin-orbital model for cubic vanadates. The spin-orbit coupling competes with Hund's exchange and triggers a novel phase, with the ordering of $t_{2g}$ orbital magnetic moments stabilized by the tilting of VO$_6$ octahedra. It explains qualitatively spin canting and reduction of magnetization observed in YVO$_3$. At finite temperature an orbital Peierls instability in the $C$-type antiferromagnetic phase induces modulation of magnetic exchange constants even in absence of lattice distortions. The calculated spin structure factor shows a magnon splitting due to the orbital Peierls dimerization.

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