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

Research output: Contribution to journalJournal article

Published

Journal publication date2000
JournalPhysical Review Letters
Journal number1
Volume84
Number of pages4
Pages159-162
Original languageEnglish

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.