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

Authors
  • Motome, Yukitoshi
  • Seo, Hitoshi
  • Fang, Zhong
  • Nagaosa, Naoto
Type
Published Article
Publication Date
Dec 10, 2002
Submission Date
Sep 02, 2002
Identifiers
DOI: 10.1103/PhysRevLett.90.146602
arXiv ID: cond-mat/0209021
Source
arXiv
License
Unknown
External links

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.

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