Dephasing in disordered metals with superconductive grains

The temperature dependence of electron dephasing time tau(phi)(T) is calculated for a disordered metal with a 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 ne...

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Bibliographic Details
Published inPhysical review letters Vol. 92; no. 24; p. 247002
Main Authors Skvortsov, M A, Larkin, A I, Feigel'man, M V
Format Journal Article
LanguageEnglish
Published United States 18.06.2004
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Summary:The temperature dependence of electron dephasing time tau(phi)(T) is calculated for a disordered metal with a 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 tau(-1)(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.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.92.247002