Sequentially evaporated thin Y-Ba-Cu-O superconductor films: Composition and processing effects
- Ohio State University, Columbus, Ohio 43210 (USA)
- NASA Lewis Research Center, Cleveland, Ohio 44135 (USA)
Thin films of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} have been grown by sequential evaporation of Cu, Y, and BaF{sub 2} on SrTiO{sub 3} and MgO substrates. The onset temperatures were as high as 93 K, while T{sub c} was 85 K. The Ba/Y ratio was varied from 1.9 to 4.0. The Cu/Y ratio was varied from 2.8 to 3.4. The films were then annealed at various times and temperatures. The times ranged from 15 min to 3 hours, while the annealing temperatures used ranged from 850 {degree}C to 900 {degree}C. There was found a good correlation between transition temperature (T{sub c}) and the annealing conditions; the films annealed at 900 {degree}C on SrTiO{sub 3} had the best T{sub c}'s. There was a weaker correlation between composition and T{sub c}. Barium poor films exhibited semiconducting normal state resistance behavior while barium rich films were metallic. The films were analyzed by resistance versus temperature measurements and scanning electron microscopy. The analysis is of the films and the correlations are reported.
- OSTI ID:
- 7123047
- Report Number(s):
- CONF-881035--
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (USA), Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Vol. 182:1; ISSN 0094-243X; ISSN APCPC
- Country of Publication:
- United States
- Language:
- English
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ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DEPOSITION
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
FILMS
HEAT TREATMENTS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCANNING ELECTRON MICROSCOPY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUBSTRATES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
THICKNESS
THIN FILMS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES