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Anomalous behavior of superconducting-normal mesoscopic structures near T-c

Shapira, S. and Linfield, E. H. and Lambert, C. J. and Seviour, R. and Volkov, A. F. and Zaitsev, A. V. (2000) Anomalous behavior of superconducting-normal mesoscopic structures near T-c. Physical Review Letters, 84 (1). pp. 159-162.

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Abstract

We observe a maximum in the conductance of Al/n-GaAs junctions at temperatures 20 mK lower than the superconducting transition temperature (T-c). This is the first observation of a peak in the conductance near the superconducting transition in superconducting-normal (S/N) junctions. To accommodate this effect we calculate the full temperature dependence of the conductance of these structures, invoking quasiclassical Green's functions in the diffusive limit. In addition to the well-known low-temperature peak at temperatures on the order of the Thouless energy, we find a maximum near T-c. This peak has the same origin as the subgap conductance observed in S/N junctions at low temperatures.

Item Type: Article
Journal or Publication Title: Physical Review Letters
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 579
Deposited By: Prof Colin J. Lambert
Deposited On: 04 Jul 2007
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 22:08
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/579

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