Conductance fluctuations in mesoscopic normal-metal/superconductor samples

Details Conductance fluctuations in mesoscopic normal-metal/superconductor samples Conductance fluctuations in mesoscopic normal-metal/superconductor samples

1997-08-21

arxiv.org/abs/cond-mat/9708162v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, REVTEX, 3 eps-figures included. To be published in Phys. Rev. Lett.. Changes: one misplaced figure corrected

Scientific paper

10.1103/PhysRevLett.79.1547

We study the magnetoconductance fluctuations of mesoscopic normal-metal/superconductor (NS) samples consisting of a gold-wire in contact with a niobium film. The magnetic field strength is varied over a wide range, including values that are larger than the upper critical field B_c2 of niobium. In agreement with recent theoretical predictions we find that in the NS sample the rms of the conductance fluctuations (CF) is by a factor of 2.8 +/- 0.4 larger than in the high field regime where the entire system is driven normal conducting. Further characteristics of the CF are discussed.

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