The Josephson critical current in a long mesoscopic S-N-S junction

Abstract

We carry out an extensive experimental and theoretical study of the Josephson effect in S-N-S junctions made of a diffusive normal metal (N) embedded between two superconducting electrodes (S). Our experiments are performed on Nb-Cu-Nb junctions with highly-transparent interfaces. We give the predictions of the quasiclassical theory in various regimes on a precise and quantitative level. We describe the crossover between the short and the long junction regimes and provide the temperature dependence of the critical current using dimensionless units $e{R}_N{I}_c/{\epsilon }_c$ and $k_{B}T/{\epsilon }_c$ where ${\epsilon }_c$ is the Thouless energy. Experimental and theoretical results are in excellent quantitative agreement.

5 pages, 4 figures, slighly modified version, published

References in corpus (1)

• Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface

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