Superconductivity

Depairing current and diode effect in a bridge with disordered surface layers

P. I. Bezotosnyi, K. A. Dmitrieva

P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow

Abstract: The superconducting state of narrow bridges with normal metal layers disordered at the boundaries is considered. The critical current and magnetic field of these structures are calculated within the framework of the Ginzburg–Landau theory. The diode effect in such bridges is studied. The estimates of the depairing current made within the framework of the presented model are in quantitative agreement with the experimental data for Nb and NbN bridges. It is shown that the average diode efficiency in the considered case can reach 18%.

Keywords: superconducting bridges, critical current, Ginzburg–Landau theory, diode effect.

Received: 19.09.2024
Revised: 18.02.2025
Accepted: 16.03.2025

DOI: 10.61011/FTT.2025.03.60254.243

Bibliographic databases:

•