One-Dimensional Confinement and Enhanced Jahn-Teller Instability in LaVO${}_3$

Abstract

Ordering and quantum fluctuations of orbital degrees of freedom are studied theoretically for LaVO${}_3$ in spin-C-type antiferromagnetic state. The effective Hamiltonian for the orbital pseudospin shows strong one-dimensional anisotropy due to the negative interference among various exchange processes. This significantly enhances the instability toward lattice distortions for the realistic estimate of the Jahn-Teller coupling by first-principle LDA+$U$ calculations, instead of favoring the orbital singlet formation. This explains well the experimental results on the anisotropic optical spectra as well as the proximity of the two transition temperatures for spin and orbital orderings.

4 pages including 4 figures

References in corpus (3)

• Spin Order due to Orbital Fluctuations: Cubic Vanadates
• Transition between orbital orderings in YVO3
• Anisotropy of Mott-Hubbard gap transitions due to spin and orbital ordering in LaVO3 and YVO3

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