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.
@article{arxiv.cond-mat/9708162,
title = {Conductance fluctuations in mesoscopic normal-metal/superconductor samples},
author = {Klaus Hecker and Helmut Hegger and Alexander Altland and Klaus Fiegle},
journal= {arXiv preprint arXiv:cond-mat/9708162},
year = {2009}
}
Comments
4 pages, REVTEX, 3 eps-figures included. To be published in Phys. Rev. Lett.. Changes: one misplaced figure corrected