資料載入中.....
|
請使用永久網址來引用或連結此文件:
http://ir.ncue.edu.tw/ir/handle/987654321/14155
|
題名: | Structure and Thermopower of Solid Solution of Nickelocuprates La2-xSrxCu1-yNiy, O4 |
作者: | Liu, Chia-Jyi |
貢獻者: | 物理學系 |
日期: | 1999
|
上傳時間: | 2012-09-10T06:13:26Z
|
出版者: | Taylor&Francis |
摘要: | A series of materials represented by La2-xSrx, Cu1−y., .Niy, O4 has been prepared using a basic carbonate coprecipitation technique. The disappearance of superconductivity at higher Ni contents usually accompanies the localization of carriers at low temperatures. A metal-like temperature dependence (dR/dT > 0) occurs up to x = 0.36 and y = 0.2 with a metal-non-metal transition at low temperatures. In comparison with La1 85Sr0.15 Cu1−yNiyO4, the metal-non-metal transition can be ‘tuned’ by varying the Sr content at a given Ni content. For non-metallic samples and those materials which show localization at low temperatures, their conductivity follows the form exp[(T 0/T) v ] with ν = ¼ or ½ (variable-range hopping law), indicating that the localization of carriers is caused by disorder. When considering the effects of carrier concentrations and disorder in the system La2-xSrxCu1−yNiy.O4, the phonon-drag contribution seems to play a part in their thermopower. |
關聯: | Philosophical Magazine B, 79(8): 1145-1159 |
顯示於類別: | [物理學系] 期刊論文
|
文件中的檔案:
檔案 |
大小 | 格式 | 瀏覽次數 |
2020200410061.pdf | 50Kb | Adobe PDF | 492 | 檢視/開啟 |
|
在NCUEIR中所有的資料項目都受到原著作權保護.
|