We extend the moment approach to the superconducting state of the attractive Hubbard model and discuss the crossover from the weak (BCS) to intermediate coupling regime from the perspective of the single-particle spectral densities. (Dept480)
By: Morten Holm Pedersen, Toni Schneider, Jose-Jesus Rodriguez-Nunez (Univ. Federal Fluminense, Brazil) and Hans Beck (Univ. de Neuchatel, Switz.)
Published in: Physical Review B. Condensed Matter, volume , (no 1), pages 21-28 in 1997
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