Abstract
We study superconducting fluctuation effects on the quasi-two-dimensional d-p model, which can describe significant features of high-Tc superconducting cuprates. We adopt the fluctuation exchange approximation in order to derive both normal and anomalous vertices of renormalized d-electron propagators, and then solve the Bethe-Salpeter equation for the anomalous vertex and derive t-matrix as a superconducting fluctuation propagator. We calculate the normal d-electron self-energy self-consistently, and get a self-consistent solution for the circumstance in which the system is close to both antiferromagnetic and superconducting instabilities. The solution exhibits the suppression of the density of states near (± π, 0) and (0, ± π), which reflects the experimental result on the normal state of underdoped cuprates.
