SELF-CONSISTENT D(X(2)-Y(2)) PAIRING IN A 2-DIMENSIONAL HUBBARD-MODEL

Results of a conserving fluctuation exchange calculation for the superconducting state of a two-dimensional Hubbard model are presented. Self-consistent solutions for the full momentum- and frequency-dependent gap, renormalization, and frequency shift parameters have been obtained. The resulting frequency- and momentum-dependent gap is found to have d(x2-y2) symmetry. Below T(c), the maximum gap opens rapidly to a low temperature 2DELTA(0)/kT(c) value of order 10. We find that the effective interaction arising from the exchange of spin and charge fluctuations is stabilized by self-energy feedback effects as the superconducting gap opens.