Dephasing in disordered metals with superconductive grains

Skvortsov, M. A.; Larkin, A. I.; Feigel'man, M. V.

Dephasing in disordered metals with superconductive grains

Authors

Skvortsov, M. A.

Larkin, A. I.

Feigel'man, M. V.

Description

Temperature dependence of electron dephasing time $τ_ϕ(T)$ is calculated for a disordered metal with small concentration of superconductive grains. Above the macroscopic superconducting transition line, when electrons in the metal are normal, Andreev reflection from the grains leads to a nearly temperature-independent contribution to the dephasing rate. In a broad temperature range $1/τ_phi(T)$ strongly exceeds the prediction of the classical theory of dephasing in normal disordered conductors, whereas magnetoresistance is dominated (in two dimensions) by the Maki-Tompson correction and is positive.
7 pages, 2 figures