Effects of the Backward Scattering in Two-Dimensional Electron System

Abstract

Effects of the backward scattering with large momentum transfer areexamined in two-dimensional electron system with a special emphasison electrons around (π, 0), (0, π).The phase diagram is shown in the plane of temperature Tand hole doping δ in the mean field approximation and it is found that d-wave superconductivity, antiferromagnetism and π-triplet pair can coexist near half filling.