Tc enhancement in multiphonon-mediated multiband superconductivity

Bussmann-Holder, A.; Gulacsi, M.; Bishop, A.R.

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T_c enhancement in multiphonon-mediated multiband superconductivity

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Bussmann-Holder, A.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;
Department Electronic Structure Theory (Ali Alavi), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Bussmann-Holder, A., Gulacsi, M., & Bishop, A. (2002). T_c enhancement in multiphonon-mediated multiband superconductivity. Philosophical Magazine B, 82(16), 1749-1754.

Cite as: https://hdl.handle.net/21.11116/0000-000E-ED73-6

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.