Dephasing in disordered metals with superconductive grains

Details Dephasing in disordered metals with superconductive grains Dephasing in disordered metals with superconductive grains

2003-11-07

arxiv.org/abs/cond-mat/0311178v1

Phys. Rev. Lett. 92, 247002 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.92.247002

Temperature dependence of electron dephasing time $\tau_\phi(T)$ 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 $1/\tau_phi(T)$ 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.

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