Josephson properties of Nb/Cu multilayers
- Russian Academy of Sciences, Chernogolovka (Russian Federation). Inst. of Solid State Physics
- Technical Univ. of Denmark, Lyngby (Denmark). Physics Dept.
The authors report the first direct experimental observation of the Josephson properties of Nb/Cu multilayers achieved by measurements across layers. Multilayered sandwiches with a small cross-section (20 {micro}m in diameter) consisting of 10 Nb/Cu/Nb junctions in series were fabricated for such measurements. Applying RF power they observed Shapiro steps in the current-voltage characteristics. Changing the temperature they 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 sep voltage, the behavior of the I-V characteristics change. For T < T{sub 2D} hysteresis appears in the I-V characteristics and the slope of the temperature dependence of the Josephson critical current, I{sub c}(T), changes.
- OSTI ID:
- 82855
- Report Number(s):
- CONF-940142--; ISBN 0-8194-1452-2
- Country of Publication:
- United States
- Language:
- English
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