Abstract
Effective pairing interaction and superconducting transition temperature T c are investigated on the basis of the simplest d - p model by using the auxiliary particle method together with the 1/ N -expansion theory. The pairing interaction mediated by both charge and spin fluctuations is calculated by considering higher order terms in the 1/ N -expansion within the random phase approximation(RPA) to find that it is attractive only for the d x 2 - y 2 channel. T c is calculated by solving a linearized Eliashberg equation to confirm that it can be finite only for d x 2 - y 2 pairing. Doping dependence of T c seems to be consistent with experiments with a reasonable choice of the parameter for the charge-transfer energy. The highest T c is obtained at a hole-doping rate δ=0.15 and estimated to be ≃100 K. It is also shown that the spin fluctuation plays a dominant role in the system to realize the high- T c superconductivity rather than the charge fluctuation does.
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