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

Abstract

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.

4 pages, 5 figures, Revtex

References in corpus (3)

• Magnetic neutron scattering study of YVO3: Evidence for an orbital Peierls state
• Quantum behavior of Orbitals in Ferromagnetic Titanates: Novel Orderings and Excitations
• Entropy Driven Dimerization in a One-Dimensional Spin-Orbital Model

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