標題: Temperature-dependent X-ray absorption near edge spectroscopy of doped LaMnO3: Ion-size and the Jahn-Teller distortion effects
作者: Tsai, Y. T.
Chang, W. J.
Huang, S. W.
Lin, J. -Y.
Lee, J. Y.
Chen, J. M.
Wu, K. H.
Uen, T. M.
Gou, Y. S.
Juang, J. Y.
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
關鍵字: XANES;Jahn-Teller distortion;LaMnO3
公開日期: 1-May-2009
摘要: The temperature-dependent X-ray absorption near-edge spectroscopy (XANES) of LaMnO3 thin films doped with various divalent ions was systematically carried out to investigate the effects of the ion size and associated Jahn-Teller distortions (JTDs) on the electronic structure modifications. Doped LaMnO3 thin films were grown on (100) SrTiO3 and (110) NdGaO3 substrates by pulsed-laser deposition with typical thickness of 250-300 nm. Temperature-dependent resistivity p(T) and magnetization M(T) were measured. The results indicate that the drastic changes in magneto-transport properties induced by the substitution of A-site ion and the splitting of the O K-edge pre-edge peak associated with the e(g)(up arrow) and t(2g)(down arrow) energy levels at low temperatures in La1-xCaxMnO3 and La1-xSrxMnO3 (x = 0.3, 0.375) may both relate to the lattice disorder and the associated JTD effects on modifying the electronic structure of doped-LaMnO3. (C) 2009 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.physb.2008.12.038
http://hdl.handle.net/11536/149777
ISSN: 0921-4526
DOI: 10.1016/j.physb.2008.12.038
期刊: PHYSICA B-CONDENSED MATTER
Volume: 404
起始頁: 1404
結束頁: 1408
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