Gap anisotropy in multiband superconductors based on multiple scattering theory
Saunderson, Tom G. (University of Bristol)
Annett, James (University of Bristol)
Újfalussy, Balázs (Hungarian Academy of Sciences)
Csire, Gabor (Institut Català de Nanociència i Nanotecnologia)
Gradhand, Martin (University of Bristol)

Data:	2020
Resum:	We 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.
Ajuts:	European Commission 754510
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Bogoliubov-de Gennes equations ; Korringa-Kohn-Rostoker method ; Multi-band superconductors ; Multiple-scattering theory ; Phenomenological parametrization ; Superconducting state ; Theoretical framework ; Three-dimensional crystals
Publicat a:	Physical review B, Vol. 101, Issue 6 (February 2020) , art. 64510, ISSN 2469-9969

DOI: 10.1103/PhysRevB.101.064510

Preprint 11 p, 8.7 MB

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