Pairing correlations in electron-doped cuprates - art. no. 214518

We calculate on-site s, extended s and d(x 2-y 2) pairing correlation funct ions in a generalized Hubbard model for the cuprates, for parameters approp riate for electron-doped systems, using numerical diagonalization of a 4 x 4 cluster. We find indications of d-wave superconductivity for small doping (similar to0.1 electrons per unit cell) and s-wave superconductivity for o verdoped systems (similar to0.5 electrons per unit cell) or small U. The ma gnitude of the pairing correlation functions and the vertex contributions t o them are in general much smaller than in the hole-doped case. We also pre sent results for the spin-structure factor.