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

2005/07/19 by Hiroshi Watanabe, Masao Ogata · 1 citation
Physics and Astronomy · #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1143/jpsj.74.2901

published as J. Phys. Soc. Jpn. 74 (2005) 2901 · 4 pages, 5 figures

arxiv created 2005/07/19 · arxiv updated 2009/12/01

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_0.35CoO₂1.3H₂O and theta-type organic condoctors.

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