Fermi-liquid parameters and superconducting instabilities of a generalizedt-Jmodel

Abstract

We investigate the Fermi-liquid parameters and the superconducting instabilities of the t-J model using a systematic large-N expansion. We compare our results with the predictions of the Brinkman-Rice picture. The leading superconducting instability is in the d-wave channel and has cos${\mathit{K}}_{\mathit{x}}$-cos${\mathit{K}}_{\mathit{y}}$ symmetry and increases with doping.