I wish to present a review of our present understanding of the phenomenon of superconductivity. It was recognized in the early work of London and others that superconductivity is a cooperative effect of the electrons such that they condense into a many-body state described by a single wave function and this state is such that it resists deformations. The concept of such a cooperative effect is inherent in the wave function of Bardeen, Cooper, and Schrieffer1 (referred to hereafter as BCS) where the Bloch states are paired, the different pairs being both occupied or unoccupied, in the configurations which are coherently superposed in the many-body wave function.
KeywordsSpectral Function Impurity Scattering Spectral Form Meissner Effect Galilean Invariance
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