NbN /SUB x/ - NbO /SUB y/ - PbIn /SUB z/ Josephson junctions with r. f. oxidised tunneling barriers
Journal Article
·
· IEEE Trans. Magn.; (United States)
The authors report the fabrication of high quality Josephson tunnel junctions made by the r.f. sputter-deposition method. The characteristics of these junctions were determined at 4.2/sup 0/K as a function of the following fabrication parameters: the substrate temperature, the sputtering power during base electrode deposition, and the r.f. oxidation time for the barrier. The authors have obtained critical current densities from 90 to 800 Amperes/cm/sup 2/ which depended exponentially on the barrier formation time, a gap energy of 3.3meV, and hysteretic current-voltage characteristics. Thermal cycling of a few junctions resulted in small changes in the currentvoltage curves. Auger Electron Spectroscopy and ESCA of the films show that x=1.02, z=0.25, and that the niobium oxide is a mixture of Nb/sub 2/O/sub 5/ and the lower oxides, NbO and NbO/sub 2/, that are present at the oxidebase electrode interface.
- Research Organization:
- Dept. of Electrical Engineering and Applied Physics, Case Western Reserve University, Cleveland, OH 44106
- OSTI ID:
- 5626077
- Journal Information:
- IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. 19:3; ISSN IEMGA
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Conference
·
Thu Feb 28 23:00:00 EST 1991
· IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)
·
OSTI ID:6046984
Anodized niobium as barrier for Josephson tunnel junctions
Journal Article
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· J. Appl. Phys.; (United States)
·
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Journal Article
·
Thu Mar 31 23:00:00 EST 1983
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·
OSTI ID:6092589
Related Subjects
36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AUGER ELECTRON SPECTROSCOPY
CHALCOGENIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CURRENTS
ELECTRON SPECTROSCOPY
FABRICATION
JOSEPHSON JUNCTIONS
JUNCTIONS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
RF SYSTEMS
SPECTROSCOPY
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENT COMPOUNDS
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AUGER ELECTRON SPECTROSCOPY
CHALCOGENIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CURRENTS
ELECTRON SPECTROSCOPY
FABRICATION
JOSEPHSON JUNCTIONS
JUNCTIONS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
RF SYSTEMS
SPECTROSCOPY
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENT COMPOUNDS