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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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.

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Journal Article
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Physical review letters
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Deposited On:
04 Jul 2007
Last Modified:
21 Nov 2022 20:32