Supercurrent-phase relation of an Nb/AlOx/Al/AlOx/Nb-based Josephson junction at the superconducting transition of the Al Interlayer

M. Götz; M. Grajcar; E. Il’ichev; V. V. Khanin; A. B. Zorin; J. Niemeyer; H.-G. Meyer

doi:10.1103/PhysRevB.62.R14645

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Supercurrent-phase relation of an Nb/AlOx/Al/AlOx/Nb-based Josephson junction at the superconducting transition of the Al Interlayer

M. Götz, M. Grajcar, E. Il’ichev, V. V. Khanin, A. B. Zorin, J. Niemeyer, H.-G. Meyer

DOI 10.1103/PhysRevB.62.R14645 · Physical Review B

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Abstract

We experimentally investigate the current-phase relation (CPR) of an Nb/AlOx/Al/AlOx/Nb Josephson junction when it is cooled down to the superconducting transition of the aluminum interlayer at about 1.9 K. While the critical current rises by more than one order of magnitude, the CPR changes from sinusoidal to nonsinusoidal behavior. The experimental results are compared with the predictions of a recently developed microscopic model for double-barrier junctions in the dirty limit. We have found quantitative agreement between experiment and theory regarding both, the rise of critical current and the shape of the CPR.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.935	Pressure not reported	onset