Resistive transport in a mesoscopic proximity superconductor

Details Resistive transport in a mesoscopic proximity superconductor Resistive transport in a mesoscopic proximity superconductor

1996-09-19

arxiv.org/abs/cond-mat/9609182v1

Czech. J. of Phys. 46, Suppl. S6, 3107 (1996)

Physics

Condensed Matter

8 pages, 6 included epsf figures, Invited paper at the LT21 Conference, Praha, August 1996. To appear in Czech. J. of Phys. 46

Scientific paper

We 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.

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