Superconductivity and antiferromagnetism for the electron-doped cuprates

Abstract

Physical properties of electron-doped high- T c cuprates are investigated taking into account weak 3D character within the fluctuation exchange approximation. We obtain an antiferromagnetic (AF) phase with the ordering vector (π,π,π) for a low doping concentration range and a superconducting (SC) phase neighboring to it. The latter extends to relatively narrow range of doping concentration δ=( n−1) with T c decreasing with increasing δ. The SC pairing symmetry is of d x 2− y 2 -type. The calculated ratio of the gap energy and T c is about half of that for hole-doped cuprates. The AF–SC coexistent phase is found in a narrow concentration range. The one electron spectral weight and NMR spin–lattice relaxation rate are also calculated and compared with experiment.