The effect of local lattice distortion on physical properties of hexagonal rubidium tungsten bronze Rb0.23WOy
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
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