Experimental study of the effect of a supercurrent on high-resistance superconductor–insulator– normal-metal tunnel junctions

Yeouchung Yen; Soon-Gul Lee; Thomas R. Lemberger

doi:10.1103/PhysRevB.36.8408

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Experimental study of the effect of a supercurrent on high-resistance superconductor–insulator– normal-metal tunnel junctions

Yeouchung Yen, Soon-Gul Lee, Thomas R. Lemberger

DOI 10.1103/PhysRevB.36.8408 · Physical Review B

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Abstract

We have measured the low-voltage resistance of superconductor–insulator–normal-metal tunnel junctions as a function of supercurrent in the superconducting film. The superconducting films were Sn and Al. The junctions had sufficiently high resistances that nonequilibrium effects associated with a charge imbalance in the superconductor were negligible. We find that the supercurrent reduces the resistance as expected from the dirty-limit theory of superconductivity. We conclude that the theory accurately predicts the pair-breaking effects of supercurrents in films despite inevitable nonuniformities in film thickness and supercurrent density that occur in wide films.

Source-reported materials — not catalogue approval

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