Preparation of superconducting Tl sub m Ca sub n Ba sub 2 Cu sub n+1 O sub x thin films: Optical emission studies and annealing conditions for achieving single high T sub c phase
- IBM Almaden Research Center, 650 Harry Road, San Jose, CA (USA)
The preparation of superconducting Tl{sub m}Ca{sub n}Ba{sub 2}Cu{sub n+1}O{sub x} (m=1, 2; n=1, 2) thin films sputter-deposited from two oxide targets using a symmetric RF diode sputtering technique are reported. Spatially resolved optical emission data suggest no significant bombardments of the growing film by energetic particles, resulting in a film composition close to that of the sputtering targets used. The superconducting properties of these films were found to depend strongly on the target composition, substrate and substrate temperature, as well as the the post-annealing conditions used due to a substantial loss of thallium during annealing. For the films deposited on (100) MgO from Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub x} targets, post annealing in a sealed quartz tube of the films wrapped in gold foils with sintered Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub x} pellets or powders at 895 and 870 {degree}C routinely gave rise to single phase Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub x} and Tl{sub 2}Ca{sub 1}Ba{sub 2}Cu{sub 2}O{sub x} films, respectively. Annealing at 895 {degree}C with a used Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub x} films. These films are highly c-axis textured with corresponding superconducting transition temperature of 123, 104, and 115 K, respectively.
- OSTI ID:
- 6552998
- Report Number(s):
- CONF-891092-; CODEN: APCPC
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (USA), Vol. 199:1; Conference: 3. annual topical conference on high Tc superconducting thin films: processing, characterization, and applications, Boston, MA (USA), 23-27 Oct 1989; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM OXIDES
SPUTTERING
CALCIUM OXIDES
COPPER OXIDES
THALLIUM OXIDES
ANNEALING
RF SYSTEMS
SUPERCONDUCTING FILMS
TRANSITION TEMPERATURE
VAPOR DEPOSITED COATINGS
VISIBLE SPECTRA
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COATINGS
COPPER COMPOUNDS
FILMS
HEAT TREATMENTS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPECTRA
THALLIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication