Importance of controlling the Tl-oxide partial pressure throughout the processing of TlBa{sub 2}CaCu{sub 2}O{sub 7} thin films
- Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
TlBa{sub 2}CaCu{sub 2}O{sub 7} (Tl-1212) superconducting films 5000--6000 A thick have been grown on LaAlO{sub 3} (100) substrates using oxide precursors in a closed two-zone thallination furnace. Tl-1212 films can be grown with transition temperatures {similar_to}100 K, and critical current densities measured by magnetization of {ital J}{sub cm}(5 K){gt}10{sup 7} A/cm{sup 2} and {ital J}{sub cm}(77 K){gt}10{sup 5} A/cm{sup 2}. Processing conditions, substrate temperatures and Tl-oxide source temperatures are found which result in smooth, nearly phase-pure Tl-1212 films. Variations in the respective temperature ramps of the Tl-oxide zone and the substrate zone can greatly influence resulting film properties such as microstructure, morphology, superconducting transition temperature, and critical current density. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 132460
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 12 Vol. 78; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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