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

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.

preprint2012arXivOpen access
Seiya NishiyamaJoao Da ProvidenciaConstanca ProvidenciaHiromasa Ohnishi
cond-mat.supr-con
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Open access4 authors1 topic
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Seiya NishiyamaJoao Da ProvidenciaConstanca ProvidenciaHiromasa Ohnishi

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