Interplay of pairing correlation and Coulomb correlation in Boson exchange superconductors

A theoretical methodology for exploring the conventional Bardeen–Cooper–Schrieffer (BCS) pairing instability superconductivity from a correlated normal phase all possible degrees of many-body correlation has been developed. The Gutzwiller projection scheme with parameter was made use in generating BCS state. variational thereafter implemented, leading to self-consistent equation superconducting gap function. This shows explicit dependence function on many body parameter. ‘pairing-gap’ and corresponding zero limit, becomes identical nature those pure (1-well) formalism, as expected Coulomb affects significantly strength correlation. detailed consequences are being presented here.