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    題名: Effect of Co, Ni, and Cu substitution on the electronic structure of hexagonal YMnO3 studied by x-ray absorption spectroscopy
    作者: Asokan, K.;Chen, Y. S.;Pao, C. W.;Tsai, H. M.;Lee, C. W. O.;Lin, C. H.;Hsueh, H. C.;Ling, D. C.;Pong, W. F.;Chiou, J. W.;Tsai, M.-H.;Peña, O.;Moure, C.
    貢獻者: 淡江大學物理學系
    關鍵詞: density functional theory;doping profiles;manganese compounds;XANES;yttrium compounds
    日期: 2009-09
    上傳時間: 2010-08-09 15:47:54 (UTC+8)
    出版者: College Park: American Institute of Physics (AIP)
    摘要: X-ray absorption spectroscopy measurements have been performed to elucidate local electronic and atomic structures of orthorhombic 3d-transition metal-doped yttrium manganites (YMnO3) with chemical formulae YMn2/3Me1/3O3 (Me = Co, Ni, and Cu). The Mn L3- and K-edges x-ray absorption near-edge structure (XANES) demonstrate the direct substitution of Me2+ for Mn3+, so that the positive effective charge of Mn ions are increased. Me-doping is also found to induce substantial broadening of the Mn L3-edge feature, which suggests enhancement of the delocalization of Mn 3d eg subbands and conductivity. Local spin density approximation (LSDA)+U (Hubbard U parameter) calculations were used to understand their electronic structures.
    關聯: Applied Physics Letters 95(13), pp.131901(3 pages)
    DOI: 10.1063/1.3224905
    顯示於類別:[物理學系暨研究所] 期刊論文

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