Structure and Superconducting Properties of Bi-Sr-Ca-Cu-O Thin Films Annealed at Low Temperatures
- 1 January 1989
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 28 (1A), L97-99
- https://doi.org/10.1143/jjap.28.l97
Abstract
Thin films of the Bi-Sr-Ca-Cu-O system were prepared at substrate temperatures between 550°C and 600°C. The film deposited at 570°C showed an X-ray diffraction pattern of the high-T c phase without other phases and had a zero-resistance temperature T c at 23 K. After annealing at 570°C under the oxygen pressure of 1 atm, the zero-resistance T c increased to 47 K, but under the pressure of 0.1 atm, the crystal structure was changed and Ca-Cu-O phase appeared. On as-deposited films prepared by a low-temperature process, structure and superconducting properties are easily affected by low-temperature postannealing.Keywords
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