Superconductivity and antiferromagnetism for the electron-doped cuprates

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 (pi, pi, pi) for a low doping concentration range and a superconducting (SC) phase neighboring to it. The latter extends to relatively narrow range of doping concentration delta = (n - 1) with T-c decreasing with increasing delta. The SC pairing Symmetry is of d(x2-y2)-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. (C) 2002 Elsevier Science Ltd. All rights reserved.