Charge order and superconductivity in a two-dimensional triangular lattice at n=2/3

Details Charge order and superconductivity in a two-dimensional triangular lattice at n=2/3 Charge order and superconductivity in a two-dimensional triangular lattice at n=2/3

2005-07-14

arxiv.org/abs/cond-mat/0507330v2

J. Phys. Soc. Jpn. 74 (2005) 2901

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1143/JPSJ.74.2901

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.

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