Superexchange in the quarter- filled two- leg ladder system NaV2O5
Abstract
A theory of superexchange in the mixed valent layer compound NaV2O5 is presented which provides a consistent description of exchange both in the disordered and charge ordered state. Starting from results of band structure calculations for NaV2O5 first an underlying electronic model for a ladder unit in the Trellis lattice is formulated. By using the molecular orbital representation for intra-rung electronic states a second-order perturbation procedure is developed and an effective spin-chain model for a ladder is derived. Variation of the resulting superexchange integral J is examined numerically as the ladder system evolves from a charge disordered to the extreme ('zig-zag') charge ordered state. It is found that the effective intra- ladder superexchange is always antiferromagnetic.
Cite
@article{arxiv.cond-mat/0008322,
title = {Superexchange in the quarter- filled two- leg ladder system NaV2O5},
author = {V. Yushankhai and P. Thalmeier},
journal= {arXiv preprint arXiv:cond-mat/0008322},
year = {2018}
}
Comments
18 pages Revtex, 7 Postscript figures