Direct Measurement of the Josephson Supercurrent in an Ultrasmall Josephson Junction

A. Steinbach; P. Joyez; A. Cottet; D. Esteve; M. H. Devoret; M. E. Huber; John M. Martinis

doi:10.1103/PhysRevLett.87.137003

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Direct Measurement of the Josephson Supercurrent in an Ultrasmall Josephson Junction

A. Steinbach, P. Joyez, A. Cottet, D. Esteve, M. H. Devoret, M. E. Huber, John M. Martinis

DOI 10.1103/PhysRevLett.87.137003 · Physical Review Letters

T1

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Abstract

We have measured the supercurrent flowing through a nonhysteretic, ultrasmall, voltage-biased Josephson junction. In contrast with experiments performed so far on hysteretic Josephson junctions, we find a supercurrent peak whose maximum Ismax increases as the temperature T decreases. The asymptotic T=0 value of Ismax agrees with the junction Ambegaokar-Baratoff critical current, as predicted by theory.

Source-reported materials — not catalogue approval

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