Charge transport through superconductor/Anderson-insulator interfaces

Aviad Frydman, Zvi Ovadyahu

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

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.

Original languageEnglish
Pages (from-to)9047-9057
Number of pages11
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number14
DOIs
StatePublished - 1997
Externally publishedYes

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