期刊論文
| 學年 | 97 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2009-03-31 |
| 作品名稱 | The effect of local lattice distortion on physical properties of hexagonal rubidium tungsten bronze Rb0.23WOy |
| 作品名稱（其他語言） | |
| 著者 | Ling, D. C.; Shao, Y. C.; Chiou, J. W.; Pong, W. F.; Wu,, S. H.; Chen, Y. Y.; Chien, F. Z. |
| 單位 | 淡江大學物理學系 |
| 出版者 | Bristol: Institute of Physics |
| 著錄名稱、卷期、頁數 | Journal of Physics: Conference Series(JPCS) 150, 052141 |
| 摘要 | Superconducting transition temperature Tc and normal-state resistivity as a function of oxygen content for hexagonal tungsten bronze Rb0.23WOy with 2.90 < y < 3.05 were obtained from transport measurements. It is remarkably interesting that Tc enhances about 50% and room-temperature resistivity increases about three orders of magnitude as oxygen content varies from 2.90 to 3.05. The low-temperature specific heat data indicate that the Einstein-like mode associated with Rb vibration has a dimensionality crossover from 3D to quasi-2D as oxygen content increases from 2.90 to 3.05. W L3-edge x-ray absorption spectra further show that W-O bond intensity gradually weakens as oxygen content increases, indicative of more oxygen disorder present in the oxygen-rich samples. The observed results strongly suggest that the local lattice distortion induced by oxygen disorder not only modulates Rb vibration, possibly coupled to electron-phonon interaction responsible for superconductivity, and also reduces the charge transfer between O 2p and W 5d orbital in the vicinity of y = 3.00. This scenario can possibly account for significant increases of Tc and normal-state resistivity of Rb0.23WOy as oxygen content slightly changes from 2.90 to 3.05. |
| 關鍵字 | |
| 語言 | en_US |
| ISSN | 1742-6596 |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | 是 |
| 國別 | GBR |
| 公開徵稿 | |
| 出版型式 | 電子版 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/79933 ) |