Abstract
Pb0.7Cu0.3Sr2Y0.5Ca 0.5Cu2Oy was synthesized as a mother specimen in air and then annealed under two different experimental conditions, in an oxidizing and in a reducing condition. The mother specimen was a nonsuperconductor, but both annealed specimens, one quenched from high temperature and the other treated in high-pressure O2, were superconductors with Tc's of about 50 K and about 60 K, respectively. The low Cu-valence of the quenched specimen which showed superconductivity suggests a decrease in the Pb-valence, while the high Tc of the specimen treated in high-pressure O2 would be explained by high Cu-valence and Pb4+.
Original language | English |
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Pages (from-to) | 204-207 |
Number of pages | 4 |
Journal | Physica C: Superconductivity and its applications |
Volume | 263 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - May 1996 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering