Dephasing in disordered metals with superconductive grains

Abstract

Temperature dependence of electron dephasing time ${\tau }_{\varphi }(T)$ 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 $1/{\tau }_{p}hi(T)$ 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

References in corpus (8)

• Dephasing of Electrons in Mesoscopic Metal Wires
• Electron--electron Interactions in Disordered Metals: Keldysh Formalism
• Interaction effects and phase relaxation in disordered systems
• Quantum Superconductor-Metal Transition in a 2D Proximity-Coupled Array
• Quantum superconductor-metal transition in a proximity array
• Two-loop approximation in the Coulomb blockade problem
• Superconductive proximity effect in interacting disordered conductors
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