Physics – Condensed Matter – Superconductivity
Scientific paper
2006-02-04
J. Phys. Soc. Jpn. 75, 074707 (2006)
Physics
Condensed Matter
Superconductivity
15 pages, 17 figures, submitted to J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.75.074707
A half-filled-band Hubbard model on an anisotropic triangular lattice (t in two bond directions and t' in the other) is studied using an optimization variational Monte Carlo method, to consider the Mott transition and superconductivity arising in \kappa-BEDT-TTF_2X. Adopting wave functions with doublon-holon binding factors, we reveal that a first-order Mott (conductor-to-nonmagnetic insulator) transition takes place at U=U_c approximately of the band width, for a wide range of t'/t. This transition is not directly connected to magnetism. Robust d-wave superconductivity appears in a restricted parameter range: immediately below U_c and moderate strength of frustration (0.4\lsim t'/t\lsim 0.7), where short-range antiferromagnetic correlation sufficiently develops but does not come to a long-range order. The relevance to experiments is also discussed.
Inoue Jun-ichiro
Tanaka Yukio
Watanabe Tsutomu
Yokoyama Hisatoshi
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