High-spin systems with orbital degeneracy are studied in the large spin limit. In the absence of Hund's coupling, the classical spin model is mapped onto disconnected orbital systems with spins up and down, respectively. The ground state of the isotropic model is an orbital valence bond state where each bond is an orbital singlet with parallel spins, and neighbouring bonds interact antiferromagnetically. The possible relevance to the transition metal oxides are discussed.
@article{arxiv.cond-mat/0111426,
title = {Theory for high spin systems with orbital degeneracy},
author = {Shun-Qing Shen and X. C. Xie and F. C. Zhang},
journal= {arXiv preprint arXiv:cond-mat/0111426},
year = {2009}
}
Comments
4 page, three figures, to appear in Phys. Rev. Lett