Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface
- 1 January 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 76 (1) , 130-133
- https://doi.org/10.1103/physrevlett.76.130
Abstract
We identify the different contributions to quantum interference in a mesoscopic metallic loop in contact with two superconducting electrodes. At low temperature, a flux-modulated Josephson coupling is observed with strong damping over the thermal length . At higher temperature, the magnetoresistance exhibits -periodic oscillations with power law decay. This flux-sensitive contribution arises from coherence of low-energy quasiparticle states over the phase-breaking length . Mesoscopic fluctuations contribute as a small oscillation, resolved only in the purely normal state.
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