Josephson properties of Nb/Cu multilayers

Vladimir M. Krasnov; Niels F. Pedersen

doi:10.1117/12.179162

29 June 1994 Josephson properties of Nb/Cu multilayers

Vladimir M. Krasnov, Niels F. Pedersen

Proceedings Volume 2157, Superconducting Superlattices and Multilayers; (1994) https://doi.org/10.1117/12.179162
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We report the first direct experimental observation of the Josephson properties of Nb/Cu multilayers achieved by measurements across layers. Multilayered sandwiches with a small crossection (20 pm in diameter) consisting of 1 0 Nb/Cu/Nb junctions in series were fabricated for such measurements. Applying RF power we observed Shapiro steps in the current-voltage characteristics. Changing the temperature we have seen the sequential change in the principal Shapiro step voltage representing the change in the number of the phase-locked junctions. This phenomenon is a direct evidence for the dimensional 3D-2D crossover responsible for the subdivision of the sample in the individual layers. Simultaneously with the change of the RF step voltage, the behavior of the I-V characteristics change. For T < T2D hysteresis appears in the I-V characteristics and the slope of the tem perature dependence of the Josephson critical current, I (T), changes.

Citation Download Citation

Vladimir M. Krasnov and Niels F. Pedersen "Josephson properties of Nb/Cu multilayers", Proc. SPIE 2157, Superconducting Superlattices and Multilayers, (29 June 1994); https://doi.org/10.1117/12.179162

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