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29 March 2024
 
  » arxiv » cond-mat/9609182

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Resistive transport in a mesoscopic proximity superconductor
P. Charlat ; H. Courtois ; Ph. Gandit ; D. Mailly ; A.F. Volkov ; B. Pannetier ;
Date 19 Sep 1996
Journal Czech. J. of Phys. 46, Suppl. S6, 3107 (1996)
Subject cond-mat
Affiliation CRTBT-CNRS, Grenoble, France, LMM-CNRS, Bagneux, France, IRE-RAS, Moscow, Russia
AbstractWe review transport measurements in a normal metal (N) in contact with one or two superconducting (S) islands. From the experiment, we distinguish the Josephson coupling, the mesoscopic fluctuations and the proximity effect. In a loop-shaped N conductor, we observe large h/2e-periodic magnetoresistance oscillations that decay with temperature T with a 1/T power-law. This behaviour is the signature of the long-range coherence of the low-energy electron pairs induced by the Andreev reflection at the S interface. At temperature and voltage below the Thouless energy $hbar D / L^2$, we observe the re-entrance of the metallic resistance. Experimental results agree with the linearized quasiclassical theory.
Source arXiv, cond-mat/9609182
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