Josephson properties of Nb/Cu multilayers
- Physics Department, The Technical University of Denmark, DK-2800, Lyngby (Denmark)
- Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow District (Russian Federation)
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 [mu]m 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 [ital I]-[ital V] characteristics change. For [ital T][lt][ital T][sub 2D] hysteresis appears in the [ital I]-[ital V] characteristics and the slope of the temperature dependence of the Josephson critical current, [ital I][sub [ital c]]([ital T]) , changes.
- OSTI ID:
- 6649737
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 49:18; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER
JOSEPHSON EFFECT
PROXIMITY EFFECT
NIOBIUM
SUPERCONDUCTING JUNCTIONS
CRITICAL CURRENT
ELECTRIC CONDUCTIVITY
HYSTERESIS
TEMPERATURE DEPENDENCE
CURRENTS
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
JUNCTIONS
METALS
PHYSICAL PROPERTIES
TRANSITION ELEMENTS
360107* - Metals & Alloys- Superconducting Properties- (1992-)
665412 - Superconducting Devices- (1992-)