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This article is cited in 2 scientific papers (total in 2 papers)
CONDENSED MATTER
Suppression of superconductivity in disordered films: interplay of two-dimensional diffusion and three-dimensional ballistics
D. S. Antonenkoabc, M. A. Skvortsovac a Skolkovo Institute of Science and Technology, Moscow, 121205 Russia
b Moscow Institute of Physics and Technology (National Research University), Dolgoprudnyi, Moscow region, 141700 Russia
c Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia
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 $\delta T_c/T_{c0} \sim - 1/k_Fl$, 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.
Received: 03.09.2020 Revised: 08.09.2020 Accepted: 08.09.2020
Citation:
D. S. Antonenko, M. A. Skvortsov, “Suppression of superconductivity in disordered films: interplay of two-dimensional diffusion and three-dimensional ballistics”, Pis'ma v Zh. Èksper. Teoret. Fiz., 112:7 (2020), 466–474; JETP Letters, 112:7 (2020), 428–436
Linking options:
https://www.mathnet.ru/eng/jetpl6269 https://www.mathnet.ru/eng/jetpl/v112/i7/p466
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