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    題名: The effect of local lattice distortion on physical properties of hexagonal rubidium tungsten bronze Rb0.23WOy
    作者: Ling, D. C.;Shao, Y. C.;Chiou, J. W.;Pong, W. F.;Wu,, S. H.;Chen, Y. Y.;Chien, F. Z.
    貢獻者: 淡江大學物理學系
    日期: 2009-03-31
    上傳時間: 2013-01-15 18:05:20 (UTC+8)
    出版者: Bristol: Institute of Physics
    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.
    關聯: Journal of Physics: Conference Series(JPCS) 150, 052141
    DOI: 10.1088/1742-6596/150/5/052141
    顯示於類別:[物理學系暨研究所] 期刊論文

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