Resistive transport in a mesoscopic proximity superconductor
  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. 
P. Charlat (1), H. Courtois (1), Ph. Gandit (1), D. Mailly (2), A.F.   Volkov (3), and B. Pannetier (1) ((1) CRTBT-CNRS, Gre...