Low temperature synthesis of Y-Ba-Cu oxide films and preparation of DC-SQUIDS

Conference · Wed Mar 01 04:00:00 EST 1989 · IEEE Trans. Magn.; (United States)

OSTI ID:6087549

Matsuda, M; Matachi, A; Kuriki, S

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-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: 25:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
656100 -- Condensed Matter Physics-- Superconductivity
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMISTRY
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
ETCHING
FABRICATION
FILMS
FLUID FLOW
FLUXMETERS
LOW TEMPERATURE
MEASURING INSTRUMENTS
MICROSTRUCTURE
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMISTRY
PHYSICAL PROPERTIES
RF SYSTEMS
SPUTTERING
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTIVITY
SURFACE FINISHING
SWITCHING CIRCUITS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
VORTEX FLOW
YTTRIUM COMPOUNDS
YTTRIUM OXIDES