Title: | Temperature-dependent X-ray absorption near edge spectroscopy of doped LaMnO3: Ion-size and the Jahn-Teller distortion effects |
Authors: | 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 |
Keywords: | XANES;Jahn-Teller distortion;LaMnO3 |
Issue Date: | 1-May-2009 |
Abstract: | 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 |
Journal: | PHYSICA B-CONDENSED MATTER |
Volume: | 404 |
Begin Page: | 1404 |
End Page: | 1408 |
Appears in Collections: | Articles |