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    題名: Metal-Nonmetal Transition in Rubidium Tungsten Bronze RbxWOy
    作者: Ting, L. C.;Hsieh, H. H.;Huang, C. T.;Wang, C. B.;Ling, D. C.;Huang, K. J.;Chang, S. J.;Kang, H. H.;Chien, F. Z.;Hor, P. H.
    貢獻者: 淡江大學物理學系
    關鍵詞: metal–nonmetal transition;rubidium tungsten bronze;oxygen concentration
    日期: 2002-12-01
    上傳時間: 2013-01-15 18:30:22 (UTC+8)
    出版者: New York: Kluwer Academic Publishers-Plenum Publishers
    摘要: An oxygen concentration dependent metal–nonmetal (MN) transition was observed for Rb0.23WO y with 2.80 < y < 3.08. As 2.80 < y < 3.0, the room temperature resistivity (ρRT) of the Rb0.23WO y is about 5 × 10−4Ω cm. While in the case of y > 3.04, the ρRT of the Rb0.23WO y exhibits a four orders of magnitude increase with a value of 5 Ω cm. Correspondingly, the lattice constant along c-direction slightly shortens as oxygen concentration increases from 2.80 to 3.08. The observed results suggest that the hybridization between W 5d (t2g) and O 2p orbitals might be responsible for the MN transition. In addition, similar measurements were performed for Rb x WO3.04 and Rb x WO2.85 with 0.19 < x < 0.27. No rubidium concentration dependent MN transition was observed, indicating the electronic structure of the host WO y is not modified significantly by varying the soluble rubidium concentration.
    關聯: Journal of Superconductivity 15(6), pp.675-678
    DOI: 10.1023/A:1021288317602
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