Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface
Mesoscale and Nanoscale Physics
2009-11-07 v1 Superconductivity
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_{\phi}. Mesoscopic fluctuations contribute as a small h/e oscillation, resolved only in the purely normal state.
Keywords
Cite
@article{arxiv.cond-mat/0110584,
title = {Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface},
author = {H. Courtois and Ph. Gandit and D. Mailly and B. Pannetier},
journal= {arXiv preprint arXiv:cond-mat/0110584},
year = {2009}
}
Comments
4 pages, 3 figures