Interplay of pairing correlation and Coulomb correlation in Boson exchange superconductors

Koushik Mandal () and Ranjan Chaudhury ()
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Koushik Mandal: S.N. Bose National Centre for Basic Sciences
Ranjan Chaudhury: Ramakrishna Mission Vivekananda Educational and Research Institute

The European Physical Journal B: Condensed Matter and Complex Systems, 2021, vol. 94, issue 2, 1-11

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

Date: 2021
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DOI: 10.1140/epjb/s10051-021-00051-9

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