Metastable phases in YBCO films created by short-term annealings
| Autor: | V. A. Sukhov, A. L. Rakhmanov, M. I. Samoilov |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Superconductivity
Materials science Solid-state physics Condensed matter physics Annealing (metallurgy) Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Vacuum annealing Condensed Matter::Superconductivity Metastability Superconducting transition temperature Limiting oxygen concentration Oxygen content |
| Zdroj: | Physics of the Solid State. 45:16-20 |
| ISSN: | 1090-6460 1063-7834 |
| DOI: | 10.1134/1.1537402 |
| Popis: | The effect of short-term low-temperature annealing in air and in vacuum on the properties of HTSC films of YBCO is studied. It is shown that, under certain conditions of preparation of initial samples, a transition from the HTSC phase with the superconducting transition temperature Tc=90 K to a phase with Tc=60 K occurs without a noticeable change in the oxygen content. It is found that, as a result of short-term annealings, a transition from the HTSC phase with Tc=60 K to the phase with Tc=90 K can occur only through the vacuum annealing stage, which converts the sample into the superconducting state. Short-term annealings lead to multiple reversible “switching” of the films from one phase to another. The obtained results are of practical interest, since the proposed method can be used to quickly obtain superconducting YBCO films in various phase states. It is shown, in addition, that the annealing procedure makes it possible not only to increase the oxygen concentration but also to produce a structural rearrangement of a YBCO film. |
| Databáze: | OpenAIRE |
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