Microstructure of epitaxial YBa sub 2 Cu sub 3 O sub 7 thin films

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6066643

Mitchell, T E

Thin epitaxial films of YBa{sub 2}Cu{sub 3}O{sub 7} on single crystal substrates have been prepared in situ by laser ablation and by post situ annealing of evaporated films of Cu, Y and BaF{sub 2}. Substrates include (001) SrTiO{sub 3}, LaGaO{sub 3}, and LaAlO{sub 3}. For both in situ and post situ annealed films, epitaxial (001) grains of YBa{sub 2}Cu{sub 3}O{sub 7} form near the substrate but (100) and (010) grains tend to nucleate for thicknesses greater than {approximately}0.5{mu}m. 90{degree} grain boundaries are therefore common, as well as other defects such as small angle boundaries dislocations and stacking faults. High resolution electron microscopy of the substrate/superconductor interface shows regions of perfect epitaxy, distorted areas, amorphous regions and areas of interdiffusion. The relationship of observed microstructure to critical current density is discussed. 21 refs., 15 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6066643
• Report Number(s): LA-UR-91-887; CONF-901125--11; ON: DE91009951
• 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
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COATINGS
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CURRENTS
ELECTRON MICROSCOPY
ENERGY BEAM DEPOSITION FILMS
EPITAXY
FILMS
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
LASERS
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SUBSTRATES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS