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Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface

H. Courtois·Ph. Gandit·D. Mailly·B. Pannetier
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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 L_{T}. At higher temperature, the magnetoresistance exhibits large h/2e-periodic oscillations with 1/T power law decay. This flux-sensitive contribution arises from coherence of low-energy quasiparticles states over the phase-breaking length L_ϕ. Mesoscopic fluctuations contribute as a small h/e oscillation, resolved only in the purely normal state.

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H. Courtois, Ph. Gandit, D. Mailly, B. Pannetier. 2001-10-29. Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface. https://doi.org/10.1103/physrevlett.76.130

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