T_c enhancement in multiphonon-mediated multiband superconductivity

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In this Subject: Nuclear Physics
By this author: Bussmann-Holder A. ;&nbsp; Gulacsi M. ;&nbsp; Bishop A.R.

Authors: Bussmann-Holder A.; Gulacsi M.; Bishop A.R.

Source: Philosophical Magazine B, Volume 82, Number 16, 1 November 2002 , pp. 1749-1754(6)

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Abstract:

We study a model of a multiband Fermi-surface structure to investigate its effect on the superconducting transition temperature in the limit of a high number of bands. We consider a simple limit consisting of an infinite number of identical locally pairwise coupled bands with intraband and interband hopping and a multiband generalized Bardeen-Cooper-Schrieffer Hamiltonian. The self-consistent mean-field system of equations which determines the intraband and interband order parameters decouples to two independent equations, unless the interband hopping integral is non-zero, in which case an energetically stable superconducting phase appears, where both the intraband and the interband gaps are non-zero. We demonstrate that for all values of the interband coupling constant the critical transition temperature is enhanced compared with the pure intraband critical transition temperature. The model is equivalent to a multiple momentum exchange originating from the interband coupling and thus modelling a highly anisotropic gap structure.

Document Type: Research article

Publication date: 2002-11-01

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