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

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

2002-09-02

arxiv.org/abs/cond-mat/0209021v2

Phys. Rev. Lett. 90, 146602 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages including 4 figures

Scientific paper

10.1103/PhysRevLett.90.146602

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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