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Title

Gap anisotropy in multiband superconductors based on multiple scattering theory

AuthorsSaunderson, Tom G.; Annett, James F.; Újfalussy, Balázs; Csire, Gábor; Gradhand, Martin
Issue Date2020
PublisherAmerican Physical Society
CitationPhysical Review B 101(6): 064510 (2020)
AbstractWe implement the Bogoliubov–de Gennes equation in a screened Korringa-Kohn-Rostoker method for solving, self-consistently, the superconducting state for three-dimensional crystals. This method combines the full complexity of the underlying electronic structure and Fermi surface geometry with a simple phenomenological parametrization for the superconductivity. We apply this theoretical framework to the known s-wave superconductors Nb, Pb, and MgB2. In these materials multiple distinct peaks at the gap in the density of states were observed, showing significant gap anisotropy which is in good agreement with experiment. Qualitatively, the results can be explained in terms of the k-dependent Fermi velocities on the Fermi surface sheets exploiting concepts from BCS theory.
Publisher version (URL)https://doi.org/10.1103/PhysRevB.101.064510
URIhttp://hdl.handle.net/10261/218767
DOI10.1103/PhysRevB.101.064510
ISSN2469-9950
E-ISSN2469-9969
Appears in Collections:(CIN2) Artículos
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