Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 34: Superconductivity: Theory

TT 34.3: Talk

Wednesday, March 19, 2025, 15:30–15:45, H36

Detailed analysis of the superconducting gap with Dynes pair-breaking scattering — •Anastasiya Lebedeva and František Herman — Comenius University in Bratislava

In our work, we study the energy gap behavior within the Dynes superconductor theory. This model generalizes the Bardeen-Cooper-Schrieffer (BCS) approach by including the pair-breaking disorder, introducing the tunneling in-gap states up to a Fermi level. Elaborating on the self-consistent gap equation, we obtain useful results which are also interesting from the experimental point of view. For example, the derived relations may serve to estimate the pair-breaking impurities concentration in the superconductor i.a. using only the energy gap and the critical temperature values of the material. Moreover, we offer the heuristic gap-to-temperature dependence providing up to 5%-precision in the whole temperature range. It is a more convenient tool compared to the cumbersome numerics used by now.

This work has been supported by the Slovak Research and Development Agency under the Contract no. APVV-23-0515, by the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 945478.

Keywords: Superconducting gap; Dynes supercoductor; pair-breaking disorder; critical temperature