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    题名: Electronic structure of La0.7Ca0.3MnO3 and La0.7Ce0.3MnO3 by x-ray absorption spectroscopy
    作者: Asokan, K.;Rao, K. V. R.;Jan, J. C.;Chiou, J. W.;彭維鋒;Pong, W. F.;Kumar, Ravi;Husain, Shahid;Srivastava, J. P.
    贡献者: 淡江大學物理學系
    日期: 2002-04
    上传时间: 2009-12-31 10:52:23 (UTC+8)
    出版者: World Scientific Publishing
    摘要: Electronic structures of hole-doped and electron hole-doped manganites, La0.7Ca0.3MnO3 and La0.7Ce0.3MnO3, have been elucidated by X-ray absorption near-edge structure (XANES) spectra of O K- and Mn L3,2-edges. In the electron-doped system, La0.7Ce0.3MnO3, the spectral features of O K-edge spectra are shifted by ~ 1 eV towards the higher energy side and reduction of Mn valency from 4+ and 3+ to 3+ and 2+ is expected when compared to hole-doped manganite. The XANES of Ce M5,4-edges indicates a tetravalent state for Ce, similar to that in CeO2. Ce4+ is incorporated into the lattice of LaMnO3, resulting in the modification of MnO6 octahedra and also indicating strong hybridization of Ce 5d and/or Ce 4f states with O 2p states.
    關聯: Surface Review and Letters 9(2), pp.1053-1057
    DOI: 10.1142/S0218625X02003330
    显示于类别:[物理學系暨研究所] 期刊論文

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