標題: Magnetotransport properties, electronic structure, and microstructure of La0.7Sn0.3MnO3 thin films
作者: Cheng, T. Y.
Lin, C. W.
Chang, L.
Hsu, C. H.
Lee, J. M.
Chen, J. M.
Lin, J. -Y.
Wu, K. H.
Uen, T. M.
Gou, Y. S.
Juang, J. Y.
材料科學與工程學系
電子物理學系
物理研究所
Department of Materials Science and Engineering
Department of Electrophysics
Institute of Physics
公開日期: 1-十月-2006
摘要: Single-phase La0.7Sn0.3MnO3 (LSnMO) thin films were fabricated on LaAlO3 (LAO) substrates by pulsed laser deposition (PLD). The as-deposited films, though showed insulating characteristics with no sign of insulator-metal transition (IMT) down to very low temperatures, did display a paramagnetic-ferromagnetic transition (PFT) around 180 K. The x-ray absorption spectroscopy (XAS) of the as-deposited LSnMO films shows signature of Mn3+/Mn2+ mixed valence indicating that tetravalent Sn ions may have resulted in electron doping into the e(g) band of Mn. The transmission electron microscopy (TEM) analyses on the as-deposited LSnMO films further confirmed that the films are epitaxial with uniform composition distributions. It is suggestive that the doping level of x=0.3 in La1-xSnxMnO3 can be achieved without disrupting the perovskite structure or any composition inhomogeneity. On the other hand, ex situ annealing in oxygen as well as in argon atmosphere, though both drive the films to display IMT and a marked enhancement in the transition temperature, the preservation of LSnMO phase is somewhat doubtful. In the oxygen-annealing case, the evidence from the XAS measurements on Sn ions though showed the existence of tetravalent characteristics, the Hall measurements indicated that the obtained LSnMO films are p type in nature. Furthermore, the TEM analyses also revealed the emergence of the Sn compounds, which may ultimately drive the obtained films into La-deficient La1-xMnO3 phases.
URI: http://dx.doi.org/10.1103/PhysRevB.74.134428
http://hdl.handle.net/11536/11742
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.74.134428
期刊: PHYSICAL REVIEW B
Volume: 74
Issue: 13
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