Abstract
Spin fluctuation-induced superconductivity in quasi-two dimensional organic compounds, -BEDT-TTF salts, is investigated within a fluctuation exchange (FLEX) approximation using a half-filled Hubbard model with a right-angled isosceles triangular lattice (transfer matrices -, -´), extending a previous work above Tc. An energy gap of A2 or (x2-y2)-type develops with decreasing temperature below Tc more rapidly than in the BCS model. The calculated dynamical susceptibilities enough below Tc show sharp resonance peaks like those in certain cuprates superconductors. The calculated nuclear spin-lattice relaxation rate 1/T1 shows a T3 behaviour below Tc in accordance with experiment. Estimated values of 1/T1 are roughly consistent with experimental results. A prediction is made for the doping concentration dependence of Tc and the antiferromagnetic and superconductive instability points are calculated in the U/ against ´/ plane.
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