On intraband and interband BCS pairings in presence of hybridization in two band superconductors

We discuss the stability of the intraband (r=dd) and interband (r=sd) couplings in the presence of a constant hybridization on a two-band system. We calculate the critical temperature T c,r associated to both type of couplings and then we obtain the values of ϵr=2| U r|Δ r(0)/ k B T c,r and the isot...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2004-08, Vol.408, p.355-357
Main Authors: Ramunni, V.P., Japiassú, G.M., Troper, A.
Format: Article
Language:English
Subjects:
Hybridization
Isotope effect
Superconductivity
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Summary:We discuss the stability of the intraband (r=dd) and interband (r=sd) couplings in the presence of a constant hybridization on a two-band system. We calculate the critical temperature T c,r associated to both type of couplings and then we obtain the values of ϵr=2| U r|Δ r(0)/ k B T c,r and the isotope coefficients γ r. One shows that under some circumstances, one can obtain values for ϵ r and γ r which differ considerably from standard BCS couplings for both Cooper pairings.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2004.02.097