Superconductivity and spin correlation in organic conductors: A quantum Monte Carlo study

被引：89

作者：

Kuroki, K ^{[1
]}

Aoki, K ^{[1
]}

机构：

[1] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.60.3060

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The d-wave pairing correlations along with spin correlation are calculated with the quantum Monte Carlo method for the two-dimensional Hubbard model on lattice structures representing organic superconductors kappa-(BEDT-TTF)(2)X and (TMTSF)(2)X. In both cases the pairing correlations for superconducting order parameters with nodes are found to be enhanced. The symmetry and the enhancement of the pairing is systematically correlated with the spin structure factor, suggesting a spin-fluctuation mediated pairing. We have further found that, as we deform the Fermi surface to make the system approach the half-filled square lattice, the coherence of the pairing saturates while the local pairing amplitude continues to increase. [S0163-1829(99)10429-6].

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页码：3060 / 3063

页数：4

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