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Spin fluctuation-induced superconductivity in two-dimensional organiccompounds such as \kappa-(ET)_2-X is investigated by using a simplified dimerHubbard model with right-angled isosceles triangular lattice (transfer matrices-\tau, -\tau^\prime). The dynamical susceptiblity and the self-energy arecalculated self-consistently within the fluctuation exchange approximation andthe value for T_c as obtained by solving the linearized Eliashberg-typeequations is in good agreement with experiment. The pairing symmetry is ofd_{x^2-y^2} type. The calculated (U/\tau)-dependence of T_c comparesqualitatively well with the observed pressure dependence of T_c. Varying thevalue for \tau^\prime/\tau from 0 to 1 we interpolate between the squarelattice and the regular triangular lattice and find firstly that values of T_cfor \kappa-(ET)_2-X and cuprates scale well and secondly that T_c tends todecrease with increasing \tau^\prime/\tau and no superconductivity is found for\tau^\prime/\tau=1, the regular triangular lattice.Comment: 4 pages, 6 eps figures, uses jpsj.st

Spin Fluctuation-Induced Superconductivity in Organic Compounds