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    題名: Electronic and local atomic structures of (La1-xPrx)0.85Zr0.15MnO3 studied by X-ray absorption spectroscopy
    作者: Krishna Kumar, K. P.;Chiou, J.W.;Tsai, H.M.;Pao, C.W.;Jan, J.C.;Hsu, P.C.;Ling, D.C.;Chien, F.Z.;Pong, W.F.;Tsai, M.H.;Lee, J.F.
    貢獻者: 淡江大學物理學系
    日期: 2005
    上傳時間: 2011-10-24 10:40:25 (UTC+8)
    摘要: Mn L3,2-, K-, O K- and Pr M5,4-edge x-ray absorption near-edge structure (XANES) spectra of (La1−xPrx)0.85Zr0.15MnO3 (LPZMO) with x = 0, 0.05, 0.1, 0.15 and 0.2 were measured to study the electronic structure and the effect of Pr substitution. An analysis of Mn L3,2- and K-edge spectra indicates that LPZMO is an electron-doped system. Pr substitution is found to increase the average effective charge of Mn ions and to induce an additional unoccupied majority spin (\uparrow spin) eg subband in the Mn L3,2-edge XANES spectrum. Mn L3,2-, O K- and Pr M5,4-edge XANES results demonstrate that the substitution of La ions by smaller Pr ions changes O 2p–Mn 3d and O 2p–Pr 4f hybridized states. Extended x-ray absorption fine structure (EXAFS) analysis at the Mn K edge reveals clear changes in local atomic structure around Mn ions due to the Pr substitution. XANES and EXAFS analyses show a small distortion in the MnO6 octahedron or a disorder in the lattice, which may be due to localization of charge carriers and/or the increased effective positive charge of Mn ions.
    關聯: Journal of physics condensed matter 17(26), pp.4197-4205
    DOI: 10.1088/0953-8984/17/26/017
    顯示於類別:[物理學系暨研究所] 期刊論文


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