Suppression of Superconductivity in Disordered Films: Interplay of Two-Dimensional Diffusion and Three-Dimensional Ballistics: Interplay of Two-dimensional Diffusion and Three-dimensional Ballistics

D. S. Antonenko, M. A. Skvortsov

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Abstract

Suppression of the critical temperature in homogeneously disordered superconducting films is a consequence of the disorder-induced enhancement of Coulomb repulsion. We demonstrate that for the majority of thin films studied now this effect cannot be completely explained under the assumption of two-dimensional diffusive nature of electron motion. The main contribution to the suppression of T c arises from the correction to the electron-electron interaction constant coming from small scales of the order of the Fermi wavelength that leads to the critical temperature shift δT c/T c0 ∼ − 1/k Fl, where k F is the Fermi momentum and l is the mean free path. Thus almost for all superconducting films that follow the fermionic scenario of T c suppression with decreasing the film thickness, this effect is caused by the proximity to the three-dimensional Anderson localization threshold and is controlled by the parameter k Fl rather than the sheet resistance of the film.

Original languageEnglish
Pages (from-to)428-436
Number of pages9
JournalJETP Letters
Volume112
Issue number7
Early online date30 Sep 2020
DOIs
Publication statusPublished - Oct 2020

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