摘要
We have measured the thermoelectric power and resistivity of the 120 K superconductor HgBa2CaCu2O6+δ (Hg-1212) as a function of temperature and oxygen annealing. Before annealing the Seebeck coefficient is moderate and positive, suggesting that the as-grown compound is slightly under-doped. After annealing in oxygen at 200°C for 10 h, Tc was enhanced by 5 K. Further annealing increased Tc by an additional 1 K and sharpened the transition. The thermopower shifts downward with increasing doping by oxygen annealing, resembling that of the Bi-based and Tl-based systems. The carrier concentration was estimated from thermopower data and the Tc value as ∼0.13 and ∼0.14 per Cu before and after oxygen annealing, respectively.
原文 | English |
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頁(從 - 到) | 6-10 |
頁數 | 5 |
期刊 | Physica C: Superconductivity and its applications |
卷 | 217 |
發行號 | 1-2 |
DOIs | |
出版狀態 | Published - 1993 11月 10 |
All Science Journal Classification (ASJC) codes
- 電子、光磁材料
- 凝聚態物理學
- 能源工程與電力技術
- 電氣與電子工程