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--
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (USA), Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Vol. 199:1; ISSN 0094-243X; ISSN APCPC
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COATINGS
COPPER COMPOUNDS
COPPER OXIDES
FILMS
HEAT TREATMENTS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RF SYSTEMS
SPECTRA
SPUTTERING
SUPERCONDUCTING FILMS
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VAPOR DEPOSITED COATINGS
VISIBLE SPECTRA