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T c Enhancement in Multiphonon-mediated Multiband Superconductivity

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

Description

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...[Show more]

dc.contributor.authorBussmann-Holder, A.
dc.contributor.authorGulacsi, Miklos
dc.contributor.authorBishop, A.R.
dc.date.accessioned2015-12-13T22:22:28Z
dc.identifier.issn1364-2812
dc.identifier.urihttp://hdl.handle.net/1885/72268
dc.description.abstractWe 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 mode is equivalent to a multiple momentum exchange originating from the interband coupling and thus modelling a highly anisotropic gap structure.
dc.publisherTaylor & Francis Group
dc.sourcePhilosophical Magazine B
dc.titleT c Enhancement in Multiphonon-mediated Multiband Superconductivity
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume82
dc.date.issued2002
local.identifier.absfor010501 - Algebraic Structures in Mathematical Physics
local.identifier.ariespublicationMigratedxPub3158
local.type.statusPublished Version
local.contributor.affiliationBussmann-Holder, A., Max Planck Institute for Solid State Research
local.contributor.affiliationGulacsi, Miklos, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBishop, A.R., Los Alamos National Laboratory
local.description.embargo2037-12-31
local.bibliographicCitation.issue16
local.bibliographicCitation.startpage1749
local.bibliographicCitation.lastpage1754
dc.date.updated2015-12-11T07:56:49Z
local.identifier.scopusID2-s2.0-0037058470
CollectionsANU Research Publications

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