Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface
H. Courtois, Ph. Gandit, D. Mailly, B. Pannetier
DOI 10.1103/PhysRevLett.76.130 · Physical Review Letters
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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 LT. At higher temperature, the magnetoresistance exhibits h/2e-periodic oscillations with 1/T power law decay. This flux-sensitive contribution arises from coherence of low-energy quasiparticle states over the phase-breaking length Lϕ. Mesoscopic fluctuations contribute as a small h/e oscillation, resolved only in the purely normal state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.4 | Pressure not reported | onset |
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