Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1998-11-12
Phys. Rev. Lett. 82, 3332(1999)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 1 figure, RevTex
Scientific paper
10.1103/PhysRevLett.82.3332
The magnetoresistance of a granular superconductor in a strong magnetic field destroying 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 non-trivial 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. Growing the magnetic field one destroys the fluctuations, which improves the metallic properties and leads to the negative magnetoresistance.
Beloborodov Igor S.
Efetov Konstantin B.
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