Excess conductance in normal-metal/Anderson insulator/superconductor junctions

A. Vaknin; A. Frydman; Z. Ovadyahu

doi:10.1103/PhysRevB.61.13037

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Excess conductance in normal-metal/Anderson insulator/superconductor junctions

A. Vaknin, A. Frydman, Z. Ovadyahu

DOI 10.1103/PhysRevB.61.13037 · Physical Review B

T1

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Abstract

The current-voltage characteristics of Au/InOx/Pb tunnel junctions exhibit peculiar zero-bias anomalies. At low temperatures the zero-bias resistance attains saturation values that are smaller than the normal-state resistance by a factor that often exceeds 2. This zero-bias anomaly (ZBA) is also characterized by voltage δ<~Δ, where Δ is the energy gap of lead. δ depends on the thickness of the InOx layer. In the presence of a microwave field the ZBA features are affected in a nontrivial way. The possibility that these features arise from the nature of the barrier being an Anderson insulator is discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	onset