Negative Magnetoresistance of Granular Metals in a Strong Magnetic Field

I. S. Beloborodov and K. B. Efetov
Phys. Rev. Lett. 82, 3332 – Published 19 April 1999
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Abstract

The magnetoresistance of a granular superconductor in a strong magnetic field that destroys the gap in each grain is considered. It is assumed that the tunneling between grains is sufficiently large such that all conventional effects of localization can be neglected. A nontrivial sensitivity to the magnetic field comes from superconducting fluctuations leading to the formation of virtual Cooper pairs and reducing the density of states. At low temperature, the pairs do not contribute to the macroscopic transport but their existence can drastically reduce the conductivity. Increasing the magnetic field destroys the fluctuations, which improves the metallic properties and leads to the negative magnetoresistance.

  • Received 13 November 1998

DOI:https://doi.org/10.1103/PhysRevLett.82.3332

©1999 American Physical Society

Authors & Affiliations

I. S. Beloborodov1 and K. B. Efetov1,2

  • 1Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany
  • 2L. D. Landau Institute for Theoretical Physics, 117940 Moscow, Russia

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Vol. 82, Iss. 16 — 19 April 1999

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