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Negative magnetoresistance in Andreev interferometers

W. Belzig, R. Shaikhaidarov, V. V. Petrashov, and Yu. V. Nazarov
Phys. Rev. B 66, 220505(R) – Published 31 December 2002
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Abstract

We consider transport in a diffusive cross-shaped Andreev interferometer geometry, both theoretically and experimentally. A strong and unexpected modulation of the conductance with the superconducting phase is found. In particular, a reversed resistance vs phase difference is predicted, where the resistance is decreased by a phase gradient. A comparison of our quasiclassical calculation with experimental data shows quantitative agreement if we account for diamagnetic screening.

  • Received 22 October 2002

DOI:https://doi.org/10.1103/PhysRevB.66.220505

©2002 American Physical Society

Authors & Affiliations

W. Belzig

  • Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

R. Shaikhaidarov and V. V. Petrashov

  • Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 OEX, United Kingdom

Yu. V. Nazarov

  • Department of Applied Physics, Delft University of Technology, Lorentzweg 1, 2628CJ Delft, The Netherlands

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Vol. 66, Iss. 22 — 1 December 2002

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