Epitaxial superconducting thin films of YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ on KTaO/sub 3/ single crystals

Journal Article · Mon Mar 13 04:00:00 EST 1989 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.101426· OSTI ID:6419290

Feenstra, R; Boatner, L A; Budai, J D; Christen, D K; Galloway, M D; Poker, D B

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), Journal Name: Appl. Phys. Lett.; (United States) Vol. 54:11; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COATINGS
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
DATA
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
EPITAXY
EVAPORATION
EXPERIMENTAL DATA
FABRICATION
FILMS
INFORMATION
LOW TEMPERATURE
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
TANTALUM COMPOUNDS
TANTALUM OXIDES
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VACUUM EVAPORATION
VAPOR DEPOSITED COATINGS
VAPOR PHASE EPITAXY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES