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      Crossover from Josephson to multiple Andreev reflection currents in atomic contacts.

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          Abstract

          The basic current-carrying mechanism through a superconducting weak link embedded in a resistive environment undergoes a continuous crossover, as the voltage increases, from Josephson Cooper pair transfer exciting electromagnetic modes in the environment to multiple Andreev reflections leading to the creation of quasiparticles. We corroborate these ideas through measurements of the dc current-voltage characteristics of superconducting atomic contacts containing channels of arbitrary and adjustable transmission. We present a simple model, in the spirit of the classical resistively shunted junction model, that accounts well for the observed characteristics.

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          Affiliations
          [1 ] Quantronics Group, Service de Physique de l'Etat Condensé (CNRS URA 2464), DSM/DRECAM/SPEC, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France.
          Journal
          Phys. Rev. Lett.
          Physical review letters
          American Physical Society (APS)
          0031-9007
          0031-9007
          Aug 10 2007
          : 99
          : 6
          10.1103/PhysRevLett.99.067008
          17930862

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