Analysis of the proximity-induced Josephson effect in superconducting-normal contacts

A. M. Kadin

doi:10.1103/PhysRevB.41.4072

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Analysis of the proximity-induced Josephson effect in superconducting-normal contacts

A. M. Kadin

DOI 10.1103/PhysRevB.41.4072 · Physical Review B

T1

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Abstract

Several investigators have observed microwave-induced steps and other Josephson-like features in the I-V characteristics of point contacts between a conventional superconductor (S) and a normal metal (N). Recently, S. Han et al. have interpreted these results in terms of a model of a proximity-induced Josephson effect (PIJE) in an SN contact and have used this model to infer the existence of p-wave pairing in superconducting UBe13. We show that their model is incorrect on fundamental grounds, and that their PIJE analysis is in direct conflict with long-standing theoretical and experimental studies of the pair-field susceptibility in SN tunnel junctions. In addition, we outline a possible alternative explanation for the experimental observations of Han et al. based on a model of a phase-slip center near the tip of the S point in an SN contact.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown