Critical current density measurements of thin films of YBaCuO

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

OSTI ID:6086230

Allen, L H; Claassen, J H; Broussard, P R

Thin films of the YBaCuO superconductor have been deposited by evaporation on SrTiO/sub 3/ substrates. After a post-anneal, the films were patterned into a four-probe geometry and critical current density measurements made using a transport technique. Compositions both on and off the stoichiometric Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-x/ were studied, and measurements made as a function of temperature and magnetic field. At 4.2 K and in ambient field, a stoichiometric film has a J/sub c/ greater than 10/sup 6/ A/cm/sup 2/ which falls off slowly out to approx.55K and then follows a power law dependence (1 - t)/sup 3.3/, where t is the reduced temperature. The magnetic field dependence of J/sub c/ at 4.2 K is weak, and for applied fields of 90 kOe, J/sub c/ has dropped only a factor of 10 from the ambient field. Off-stoichiometric films have lower J/sub c/'s which fall off faster than at lower temperatures.

• Research Organization: 4563000
• OSTI ID: 6086230
• 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-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CURRENTS
EVAPORATION
FABRICATION
FILMS
GEOMETRY
JUNCTIONS
MAGNETIC FIELDS
MATHEMATICS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUBSTRATES
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
TECHNOLOGY ASSESSMENT
TEMPERATURE DEPENDENCE
THIN FILMS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VOLTAGE DROP
YTTRIUM COMPOUNDS
YTTRIUM OXIDES