QUASI-NORMAL OCCUPANCY FOR HIGH-T-C SUPERCONDUCTOR CUPRATES

A model with quasi-normal occupancy is applied to several typical high -T-c superconductors obtaining tighter-bound Cooper fermion pairs. Wit hin this model a small energy gap of the order of the Debye energy nea r the Fermi surface is proposed. An important physical requirement of the model is that the anomaly in the occupancy occurs simultaneously t o the pair formation. The role of the variation of the ratio R = 2 Del ta(0)/kT(c) in the range 2 - 10 is studied. The phonon barrier can be overcomed and then obtain a good description of high-T-c superconducto r cuprates in all the range of values for R suggested by experimental results.