Orbital disorder induced by charge fluctuations in vanadium spinels
Strongly Correlated Electrons
2012-08-13 v1 Statistical Mechanics
Abstract
Motivated by recent experiments on vanadium spinels, VO, that show an increasing degree of electronic delocalization for smaller cation sizes, we study the evolution of orbital ordering (OO) between the strong and intermediate-coupling regimes of a multi-orbital Hubbard Hamiltonian. The underlying magnetic ordering of the Mott insulating state leads to a rapid suppression of OO due to enhanced charge fluctuations along ferromagnetic bonds. Orbital double-occupancy is rather low at the transition point indicating that the system is in the crossover region between strong and intermediate-coupling regimes when the orbital degrees of freedom become disordered.
Keywords
Cite
@article{arxiv.1205.1081,
title = {Orbital disorder induced by charge fluctuations in vanadium spinels},
author = {Yasuyuki Kato and Gia-Wei Chern and K. A. Al-Hassanieh and Natalia B. Perkins and C. D. Batista},
journal= {arXiv preprint arXiv:1205.1081},
year = {2012}
}