Anomalous Behavior of Superconducting-Normal Mesoscopic Structures near Tc
S. Shapira, E. H. Linfield, C. J. Lambert, R. Seviour, A. F. Volkov, A. V. Zaitsev
DOI 10.1103/PhysRevLett.84.159 · Physical Review Letters
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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 (Tc). 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 Tc. This peak has the same origin as the subgap conductance observed in S/N junctions at low temperatures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | onset |
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