✦ LIBER ✦
Large critical-temperature depression in Ga-1212 cuprate Ba2YCu2.85Ga0.15Oz by annealing at high pressures of oxygen
✍ Scribed by Akira Ono
- Book ID
- 103950692
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 342 KB
- Volume
- 269
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
The compound Ba2YCu2.85Ga0.1506. 9 is annealed at various temperatures under high pressures of oxygen to study the dependence of superconducting transition temperature (T c) on annealing temperature. T~ is enhanced from 76 K to 92 K by annealing at 500°C for 3 h and to 84 K by annealing at 990°C for 0.5 h. The T c is however lowered to 30 K after annealing at 995°C for 3 h. The large T c depression is attributable to the partial substitution of Ga at planar Cu sites which depends on temperature and time of the annealing.