Properties of niobium superconducting bridges prepared by electron-beam lithography and ion implantation
Niobium superconducting bridges having a variable-thickness geometry consisting of a thin narrow implanted region joining two much thicker bulk films have been fabricated. The temperature dependence of the critical current is described well by the static theory of Likharev and Yakobson. The direct current and alternate current Josephson effects were observed at temperatures above the transition temperature T'/sub c/ of the bridge. The magnetic field period of the ''diffraction pattern'' dependence on magnetic field is analyzed taking into account demagnetizing effects in an approximate way. This field period H/sub p/ is found as a function of the bridge width w and the length L for wide bridges (w/L>>1), i.e., H/sub p/= (Phi/sub 0//..mu../sub 0/)/ 2/sup 2/3/w/sup 5/3/L/sup 1/3/.
- Research Organization:
- Department of Electrical Engineering, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka, Japan
- OSTI ID:
- 5832095
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 50:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
SUPERCONDUCTING DEVICES
ION IMPLANTATION
CRITICAL CURRENT
ELECTRON BEAMS
FABRICATION
FILMS
GEOMETRY
JOSEPHSON EFFECT
MAGNETIC FIELDS
MATHEMATICAL MODELS
NIOBIUM
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
BEAMS
CURRENTS
ELECTRIC CURRENTS
ELEMENTS
LEPTON BEAMS
MATHEMATICS
METALS
PARTICLE BEAMS
PHYSICAL PROPERTIES
REFRACTORY METALS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
420201* - Engineering- Cryogenic Equipment & Devices