Charge transport through superconductor/Anderson-insulator interfaces

Aviad Frydman; Zvi Ovadyahu

doi:10.1103/PhysRevB.55.9047

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Charge transport through superconductor/Anderson-insulator interfaces

Aviad Frydman, Zvi Ovadyahu

DOI 10.1103/PhysRevB.55.9047 · Physical Review B

T1

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Abstract

We report on a study of charge transport through superconductor-insulator-superconductor and normal metal–insulator–superconductor structures (SIS and NIS junctions, respectively) where the insulator is of the Anderson type. Devices which are characterized by a junction resistance larger than 10 kΩ show behavior which is typical of Giaever tunnel junctions. In structures having smaller resistance, several peculiar features are observed. In the SIS junctions, Josephson coupling is detected over distances much larger then the typical insulator localization length. In addition, a series of resistance peaks appears at voltages of 2Δ/n, where Δ is the superconducting gap. The NIS Junctions exhibit a large resistance dip at subgap bias. We discuss possible interpretations of these findings and suggest that they may result from the presence of high transmission channels through the barrier region.

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	unknown