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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27701

    Title: Electronic structures of La0.7-xCsxCa0.3MnO3 probed by X-ray absorption spectroscopy
    Authors: Chandra, Usha;Jan, J. C.;Chiou, J. W.;Asokan, K.;彭維鋒;Pong, W. F.
    Contributors: 淡江大學物理學系
    Keywords: XANES;Manganites;Monovalent ions
    Date: 2003-01
    Issue Date: 2009-12-31 10:38:27 (UTC+8)
    Publisher: Elsevier
    Abstract: We report X-ray absorption near edge structure (XANES) spectra of La0.7−xCsxCa0.3MnO3 (x=0, 0.01, 0.05, 0.1) at the Mn, O K- and Mn L3,2-edges. In a stoichiometric compound, the substitution of Cs for La-site could drive a fraction of Mn ions to 5+ valency state. The experimental XANES spectra at Mn K-edge do not support such a proposal. To account this result, one needs to consider the effect of ionic radius of Cs. It is likely that both ionic radius of Cs and valency of Mn act in opposite directions. The XANES spectra both at O K-, and Mn L3,2-edges exhibit prominent changes due to Cs doping, such observed changes are explained by considering Mn 3d–O 2p hybridization and the crystal field effects of Mn ions.
    Relation: Nuclear Instruments and Methods in Physics Research Section B 199, pp.185-189
    DOI: 10.1016/S0168-583X(02)01423-4
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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