Epitaxial superconducting thin films of YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ on KTaO/sub 3/ single crystals
We have grown thin YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ films on single-crystal (001)= KTaO/sub 3/ substrates by means of coevaporation of Y, BaF/sub 2/, and Cu, followed by an ex situ anneal in wet oxygen. The films are epitaxial in three dimensions, consisting of grains with either the c or the a axis of the YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ unit cell perpendicular to the substrate. Films with a composition close to the 1:2:3 cation ratio exhibit sharp superconducting transitions at 90 K and critical current densities in excess of 0.3 MA/cm/sup 2/ in zero magnetic field at 77 K. In Cu-rich films, the Y/sub 2/Ba/sub 4/Cu/sub 8/O/sub 16//sub --//sub x/ phase with a T/sub c/ of 80 K is formed in grains with the c axis perpendicular to the substrate.
- Research Organization:
- Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831
- OSTI ID:
- 6419290
- Journal Information:
- Appl. Phys. Lett.; (United States), Vol. 54:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
SUPERCONDUCTIVITY
COPPER OXIDES
SUPERCONDUCTING FILMS
FABRICATION
YTTRIUM OXIDES
CRITICAL CURRENT
CURRENT DENSITY
EXPERIMENTAL DATA
LOW TEMPERATURE
OXYGEN
POTASSIUM OXIDES
TANTALUM OXIDES
THIN FILMS
TRANSITION TEMPERATURE
VACUUM EVAPORATION
VAPOR DEPOSITED COATINGS
VAPOR PHASE EPITAXY
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COATINGS
COPPER COMPOUNDS
CURRENTS
DATA
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
EPITAXY
EVAPORATION
FILMS
INFORMATION
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
REFRACTORY METAL COMPOUNDS
TANTALUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity