Abstract
A model with quasi-normal occupancy is applied to several typical high- T c superconductors obtaining tighter-bound Cooper fermion pairs. Within this model a small energy gap of the order of the Debye energy near the Fermi surface is proposed. An important physical requirement of the model is that the anomaly in the occupancy occurs simultaneously to the pair formation. The role of the variation of the ratio R = 2Δ 0 κT c in the range 2 – 10 is studied. The phonon barrier can be overcomed and then obtain a good description of high- T c superconductor cuprates in all the range of values for R suggested by experimental results.
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