Josephson properties of Nb/Cu multilayers
V. M. Krasnov, N. F. Pedersen, V. A. Oboznov, V. V. Ryazanov
DOI 10.1103/PhysRevB.49.12969 · Physical Review B
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Abstract
We report direct experimental observations of the Josephson properties of Nb/Cu multilayers achieved by measurements across layers. Multilayered sandwiches with a small cross section (20 μm in diameter) consisting of 10 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 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 temperature dependence of the Josephson critical current, Ic(T) , changes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb/Cu Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | unknown |
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