Phase Diagram of Superconductivity on the Anisotropic Triangular Lattice Hubbard Model

Details Phase Diagram of Superconductivity on the Anisotropic Triangular Lattice Hubbard Model Phase Diagram of Superconductivity on the Anisotropic Triangular Lattice Hubbard Model

1998-07-09

arxiv.org/abs/cond-mat/9807147v2

J. Phys. Soc. Jpn. 67(1998),3691

Physics

Condensed Matter

Superconductivity

4 pages, 6 figs, submitted for publication

Scientific paper

We study the electronic states of the anisotropic triangular lattice Hubbard model at half filling, which is a simple effective model for the organic superconducting $\kappa$-BEDT-TTF compounds. We treat the effect of the Coulomb interaction by the fluctuation exchange (FLEX) method, and obtain the phase diagram of this model for various sets of parameters. It is shown that the d-wave superconductivity is realized in the wide region of the phase diagram, next to the antiferromagnetic states. The obtained phase diagram explains the characters of the experimental results very well.

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