頁籤選單縮合
題名 | The Search for Novel High Temperature Superconductors: The Ba-Ca-Cu-O System= |
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作者 | Chu,C. W.; Du,Z. L.; Xue,Y. Y.; Cao,Y.; Wu,N. L.; Sun,Y. Y.; Rusakova,I.; |
期刊 | Chinese Journal of Physics |
出版日期 | 19980400 |
卷期 | 36:2(Part2) 民87.04 |
頁次 | 頁139-148 |
分類號 | 330 |
語文 | eng |
關鍵詞 | |
英文摘要 | Following the recently observed empirical rule, two new high-temperature superconducting homologous series of the Ba-Ca-Cu-O system have been discovered by using the high pressure synthesis technique: the interstitially doped Ba₂Can₋₁CunO₂n+₂[02(n-1)n] for n=3 and 4, and the CaBa₂Can₋₁CunO₂n₊₃[Ca-12(n-1)n] for n=3. The I4-symmetric 02(n-1)n shows a Tc up to 126 K, the highest for superconductors without any volatile toxie elements, and degrades to a lower Tc compound when exposed to air; whereas the P4-symmetric Ca-12(n-1)n displays a Tc not to exceed 107 K and remains stable in air. More superconducting phases with a Tc up to 120 K have been detected in the Ba-Ca-Cu-O system, although their structures have yet to be determined. These compounds provide excellent opportunities for the study of the role of charge-reservoir in high-temperature superconductivity, and the effects of symmetry on Tc and structural instability. They may also be good material candidates for high-temperature superconducting thin-film devices operable above 120 K. |
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