Dephasing in disordered metals with superconductive grains
arXiv:cond-mat/0311178 · doi:10.1103/PhysRevLett.92.247002
Abstract
Temperature dependence of electron dephasing time $Ï_Ï(T)$ 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 $1/Ï_phi(T)$ 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