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Dephasing in disordered metals with superconductive grains.

M A Skvortsov1, A I Larkin, M V Feigel'man

  • 1L. D. Landau Institute for Theoretical Physics, Moscow 119334, Russia. skvor@itp.ac.ru

Physical Review Letters
|July 13, 2004
PubMed
Summary

Electron dephasing time in disordered metals with superconductive grains is nearly temperature-independent above the transition line. This dephasing rate significantly exceeds classical predictions, impacting magnetoresistance.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics

Background:

  • Understanding electron dephasing is crucial for quantum phenomena in disordered conductors.
  • Superconductive grains introduce unique scattering mechanisms.

Purpose of the Study:

  • To calculate the temperature dependence of electron dephasing time (τ(φ)(T)) in disordered metals containing superconductive grains.
  • To investigate the role of Andreev reflection in electron dephasing.

Main Methods:

  • Theoretical calculation of electron dephasing time.
  • Analysis of temperature dependence above the superconducting transition line.

Main Results:

  • A nearly temperature-independent contribution to the dephasing rate due to Andreev reflection from superconductive grains.

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  • Observed dephasing rate (τ⁻¹(φ)(T)) significantly exceeds classical theory predictions for normal disordered conductors.
  • Magnetoresistance in two dimensions is dominated by the Maki-Thompson correction and is positive.

    • Conclusions:

    • Andreev reflection from superconductive grains plays a significant role in electron dephasing.
    • The classical theory of dephasing in normal conductors is insufficient to describe these systems.
    • The findings have implications for understanding electron dynamics in hybrid normal-superconducting materials.