Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 14: Superconductivity: Theory 1

TT 14.4: Vortrag

Montag, 16. März 2020, 16:00–16:15, HSZ 204

The superconducting gap of the disordered NbAu compound from the Bogoliubov–de Gennes equations — •Bendegúz Nyári1, Láaszló Szunyogh1,2, and Balázs Újfalussy31Budapest University of Technology and Economics, Budapest, Hungary — 2MTA-BME Condensed Matter Research Group, Budapest, Hungary — 3Wigner-MTA, Budapest, Hungary

The screened Korringa–Kohn–Rostoker (SKKR) method provides a possible solution of the Bogoliubov–de Gennes equations for superconducting heterostructures and alloys. We discuss the case of the disordered NbAu compound within the coherent potential approximation (CPA). The limit of low Nb concentration can be interpreted as a model of isolated (superconducting) Nb impurities in a (non-superconducting) Au host. We calculate the local density of states (LDOS) for the components and we investigate the formation of the superconducting gap in the Nb DOS and spectral function as we increase the concentration of the Nb doping. We study the appearance of the gap and its evolution throughout the entire concentration range.We also compare the result with the calculation of a single Nb impurity embedded into Au.

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