Charge order and superconductivity in a two-dimensional triangular lattice at n=2/3
Strongly Correlated Electrons
2007-05-23 v2 Superconductivity
Abstract
To investigate the possibility of charge order and superconductivity in a doped two-dimensional triangular lattice, we study the extended Hubbard model with variational Monte Carlo method. At n=2/3, a commensurate filling for a triangular lattice, it is shown that the nearest-neighbor Coulomb interaction V induces honeycomb-type charge order and antiferromagnetic spin order at U>10t. We also discuss the possibility of superconductivity induced by charge fluctuation and the relation to the superconductivity in Na_{0.35}CoO_{2}1.3H_{2}O and theta-type organic condoctors.
Cite
@article{arxiv.cond-mat/0507330,
title = {Charge order and superconductivity in a two-dimensional triangular lattice at n=2/3},
author = {Hiroshi Watanabe and Masao Ogata},
journal= {arXiv preprint arXiv:cond-mat/0507330},
year = {2007}
}
Comments
4 pages, 5 figures