Properties of epitaxial YBa sub 2 Cu sub 3 O sub 7 thin films on Al sub 2 O sub 3 l brace 1 012 r brace

Journal Article · Mon Feb 19 04:00:00 EST 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.103317· OSTI ID:7246841

Char, K ^[1]; Fork, D K; Geballe, T H ^[2]; Laderman, S S; Taber, R C; Jacowitz, R D ^[3]; Bridges, F ^[4]; Connell, G A.N.; Boyce, J B ^[5]

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1. Conductus, Inc., Sunnyvale, California 94086 (USA)
2. Department of Applied Physics, Stanford University, Stanford, California 94305 (USA)
3. Hewlett-Packard Company, Palo Alto, California 94304 (USA)
4. Department of Physics, University of California, Sante Cruz, California 95064 (USA)
5. Xerox Palo Alto Research Center, Palo Alto, California 94304 (USA)

Epitaxial YBa{sub 2}Cu{sub 3}O{sub 7} films were grown on Al{sub 2}O{sub 3} {l brace}{bar 1}012{r brace} by a laser ablation technique. X-ray diffraction shows that films are epitaxial with the {ital c} axis perpendicular to the substrate surface and 123'' (110) aligned with sapphire (10{bar 1}1), although the full width at half maximum of the rocking curve is larger than those of epitaxial films on SrTiO{sub 3}. Typical {ital T}{sub {ital c}}'s are between 85 and 88 K with transition widths between 0.5 and 3 K. The normal-state resistivity is 270 {mu}{Omega} cm at 300 K and extrapolates to zero at zero temperature while the magnetization {ital J}{sub {ital c}} is as high as 5{times}10{sup 6} A/cm{sup 2} at 4.2 K. High-frequency loss measurements show that 2000-A-thick epitaxial films on Al{sub 2}O{sub 3} {l brace}{bar 1}012{r brace} have a surface impedance about 1 m{Omega} at 13 GHz at 4.2 K.

• OSTI ID: 7246841
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 56:8; ISSN APPLA; ISSN 0003-6951
• 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
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
CURRENT DENSITY
DATA
DIFFRACTION
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
FABRICATION
FILMS
IMPEDANCE
INFORMATION
LOW TEMPERATURE
MAGNETIZATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
THICKNESS
THIN FILMS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES