Critical currents of superconducting microbridges
The critical currents of long uniform superconducting tin microbridges ranging in width from 0.3 to 10 ..mu..m have been measured. In the the narrowest bridges the current density is nearly uniform and the magnitude and temperature dependence of the critical-current density agree with the Ginzburg-Landau prediction. In wider bridges the current density becomes peaked at the edges of the film and the magnitude and temperature dependence of the critical current are altered. Theoretical calculations of the nonlocal linear electrodynamics together with adjustment of the nonlinear peak current density to include coherence-length effects appears adequate to explain both the magnitude and the temperature dependence of the critical currents in the wider bridges. (AIP)
- Research Organization:
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138
- OSTI ID:
- 7358538
- Journal Information:
- Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 14:3; ISSN PLRBA
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL CURRENT
CURRENTS
ELECTRIC BRIDGES
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELEMENTS
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FILMS
GINZBURG-LANDAU THEORY
METALS
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
Tin