Impurity-induced Tc reduction in high-temperature superconductors -: art. no. 174504

We study the effects of nonmagnetic impurities substituted for Cu atoms on the superconducting transition temperature T-c in high-temperature cuprate superconductors, using the d-p model within the fluctuation exchange approximation and the coherent potential approximation. T-c near the optimum-doped region reduces more rapidly than that for the over-doped region. We show that the rapid reduction of T-c is due mainly to the damping of the quasiparticle in our formalism.