Remarkable properties of Tl-Ba-Ca-Cu-O thin films following post-growth high-temperature annealing
| Autor: | Michael P. Siegal, Eugene L. Venturini, R. R. Padilla, Donald L. Overmyer, P. N. Provencio |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Superconductivity
High-temperature superconductivity Materials science Flux pinning Annealing (metallurgy) Analytical chemistry chemistry.chemical_element Condensed Matter Physics Nitrogen Electronic Optical and Magnetic Materials law.invention chemistry law X-ray crystallography Thermal stability Electrical and Electronic Engineering Thin film |
| Zdroj: | IEEE Transactions on Appiled Superconductivity. 9:1555-1558 |
| ISSN: | 1051-8223 |
| DOI: | 10.1109/77.784691 |
| Popis: | Tl-2212 and Tl-1212 are the two easiest unsubstituted Tl-Ba-Ca-Cu-O superconducting thin films to grow. Both phases exhibit T/sub c//spl ges/95 K, J/sub c/(5 K)>10 MA/cm/sup 2/ and smooth morphologies. We report on the properties of both materials following one hour furnace anneals in dry ambients of pure oxygen or nitrogen at temperatures ranging from 50-700/spl deg/C. The stability of these films to high temperatures in each ambient is important for device processing. Of equal interest is the controlled partial volatilization of Tl-oxide at modest temperatures from nano-site regions within Tl-1212 films. We correlate such modifications with increases in flux pinning strength in Tl-1212 films. Tl-2212 films maintain their superconducting properties to even higher temperatures than Tl-1212 films. Optimum annealing appears to also increase flux pinning, although not to the same degree as for Tl-1212 films. |
| Databáze: | OpenAIRE |
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