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Thermal effect in the phase-periodic conductance of disordered mesoscopic N/S structures

  • Condensed Matter
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Abstract

We report measurements of the temperature dependence of the amplitude of phase-periodic conductance oscillations in disordered (diffusive) normal metal (Ag) structures attached to a superconducting (Pb) wire at two points. The oscillation amplitude exceeds the value of e 2/h by orders of magnitude and reaches its maximum at a temperature corresponding to the Thouless energy. The results support the recent theory of Nazarov and Stoof, [Phys. Rev. Lett. 76, 823 (1996)], which takes into account the characteristic energy dependence of the change in the diffusion coefficient of quasiparticles in a normal conductor due to Andreev reflections. The line shape of the oscillations as a function of the superconducting phase difference is found to be extremely sensitive to the quality of N/S interfaces and shows hysteretic behavior in interferometers with specially prepared clean interfaces.

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Authors and Affiliations

  1. Department of Physics, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, U.K.

    V. T. Petrashov

  2. Institute of Microelectronics Technology, Russian Academy of Sciences, 142432, Chernogolovka, Moscow District, Russia

    R. Sh. Shaikhaidarov & I. A. Sosnin

Authors
  1. V. T. Petrashov
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  2. R. Sh. Shaikhaidarov
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  3. I. A. Sosnin
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Additional information

Pis’ma Zh. Éksp. Teor. Fiz. 64, No. 11, 789–793 (10 December 1996)

Published in English in the original Russian journal. Edited by Steve Torstveit.

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Petrashov, V.T., Shaikhaidarov, R.S. & Sosnin, I.A. Thermal effect in the phase-periodic conductance of disordered mesoscopic N/S structures. Jetp Lett. 64, 839–844 (1996). https://doi.org/10.1134/1.567256

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  • DOI: https://doi.org/10.1134/1.567256

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