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| 題名: | Correlation Among c/b, Tc, and Madelung Potentials in the System of RBa2Cu3Ox Superconductors |
| 作者: | Tsay, Shiow-Fon;Wang, Shou-Yih;Horng, Lance;Yang, T. J. Watson |
| 貢獻者: | 物理學系 |
| 日期: | 1989-11
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| 上傳時間: | 2013-02-05T02:16:30Z
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| 出版者: | The American Physical Society |
| 摘要: | We have observed a correlation between the lattice-constant ratio c/b and the superconducting transition temperature Tc in R-Be-Cu-O superconductors (where R is a rare-earth element). Madelung potentials and the bond length of Cu(1)-O(3) are calculated and correlated with the distribution of Tc over the various RBa2Cu3O7 superconductors. Further consideration of YBa2Cu3Ox with variable x of suitable oxygen content leads to an explanation of the correlation of decreasing c/b ratio with increasing Tc. A Coulomb-type ionic mechanism is therefore suggested so that shortening of the c axis and increased chain length provides (1) a channel of charge-transfer excitation from chain to Cu-O layers and (2) a long-range Coulomb interaction between the two Cu-O layers, both of which result in stronger coupling between the two Cu-O layers and higher Tc. .AE |
| 關聯: | Phys. Rev. B, 40(13): 9408-9411 |
| 顯示於類別: | [物理學系] 期刊論文
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