An attempt at a resonating mean-field theoretical description of thermal behavior of two-gap superconductivity

Abstract

The resonating mean-field theory (Res-MFT) has been applied and shown to effectively describe two-gap superconductivity (SC). Particularly at T=0 using a suitable chemical potential, the two-gap SC in MgB2 has been well described by the Res-Hartree-Bogoliubov theory (Res-HBT). The Res-HB ground state generated with HB wave functions almost exhausts the ground-state correlation energy in all the correlation regimes. In this paper we make an attempt at a Res-MF theoretical description of thermal behavior of the two-gap SC. In an energy-gap case we find a new formula leading to a higher Tc than the Tc of the usual HB formula.

20 pages, 3 figures. Modify Abstract, change Introduction, Section 2 drastically and modify Summary and further perspectives. Minor typos corrected. Add two Appendices and new Refernces, arXiv admin note: substantial text overlap with arXiv:1010.4740

References in corpus (2)

• Microscopic and non-adiabatic Schrödinger equation derived from the Generator Coordinate Method based on 0 and 2 quasiparticle HFB states
• The generator coordinate method in time-dependent density-functional theory: memory made simple

Cited by in corpus (1)

• Thermal resonating Hartree-Bogoliubov theory based on the projection method