Low temperature synthesis of Y-Ba-Cu oxide films and preparation of DC-SQUIDS
The authors have synthesized superconducting Y-Ba-Cu oxide thin films by rf sputtering at a relatively low substrate temperature. The films of 300-700 nm thickness have Tc of 60-72K without post-annealing after the deposition. A preferential orientation with a c-axis perpendicular to the film surface was observed. DC-SQUIDs having two parallel microbridges with constriction of submicrometer to 40..mu..m width were fabricated from the oxide films by chemical etching. The microbridges having more than 2..mu..m width did not operate as Josephson devices. The characteristics of these SQUIDs suggested vortex-flow. Periodic modulation of the voltage with magnetic flux was observed in a SQUID having submicrometer microbridges. Telegraph-like noise of the voltage which exhibits switching between two or more discrete levels was observed in all of the SQUIDs irrespective of the width of the microbridges. This telegraph-like noise was also observed in a single microbridge, and its effective switching-rate increased exponentially with the increase of temperature above 15K. A bump structure of Lorentzian due to the telegraph-like noise was dominant in the power spectral density of the flux noise of the SQUID.
- Research Organization:
- Research Institute of Applied Electricity, Hokkaido Univ., Sapporo (JP)
- OSTI ID:
- 6087549
- Report Number(s):
- CONF-880812-
- Journal Information:
- IEEE Trans. Magn.; (United States), Vol. 25:2; Conference: Applied superconductivity conference, San Francisco, CA, USA, 21 Aug 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
BARIUM OXIDES
THIN FILMS
COPPER OXIDES
SQUID DEVICES
FABRICATION
SPUTTERING
YTTRIUM OXIDES
ETCHING
LOW TEMPERATURE
MICROSTRUCTURE
PHOTOCHEMISTRY
RF SYSTEMS
SUPERCONDUCTIVITY
SWITCHING CIRCUITS
VORTEX FLOW
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
CHEMISTRY
COPPER COMPOUNDS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FILMS
FLUID FLOW
FLUXMETERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTING DEVICES
SURFACE FINISHING
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
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