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

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

1998-12-02

arxiv.org/abs/cond-mat/9812026v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, RevTeX, uses epsf.sty and multicol.sty

Scientific paper

10.1103/PhysRevB.60.3060

The d-wave pairing correlations along with spin correlation are calculated with 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.

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