標題: The magneto-transport properties of epitaxial La0.7Sn0.3MnO3 manganite thin films
作者: Cheng, TY
Hsieh, CC
Juang, JY
Lin, JY
Wu, KH
Uen, TM
Gou, YS
Hsu, CH
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
關鍵字: strain relaxation;spin glass;magnetoresistance
公開日期: 1-Aug-2005
摘要: Single-phase La0.7Sn0.3MnO3 (LSnMO) thin films were fabricated on SrTiO3 (STO) substrates by pulsed laser deposition (PLD). The as-deposited films, though were insulating with no sign of insulator-metal transition (IMT), did display paramagnetic-ferromagnetic transition (PFT) around 150 K. Ex situ annealing of the films at 850 degrees C in 250 Torr oxygen for 4 h, nonetheless, not only significantly improves the crystallographic quality but also raises IMT and PFT at 315K and 320K, respectively. The manifestations of spin-glass-like behavior in both the as-deposited and postannealed films suggest that it could be intrinsic LSnMO, albeit transport properties can be drastically changed by the strain originating from large ion-size misfit between Sn and La and film/substrate epitaxial relation. The preliminary X-ray absorption spectroscopy shows signature of Mn3+/Mn2+ mixed-valence indicating that tetravalent Sn ions does result in electron-doping into the e, band of Mn. (c) 2005 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.physb.2005.05.007
http://hdl.handle.net/11536/13435
ISSN: 0921-4526
DOI: 10.1016/j.physb.2005.05.007
期刊: PHYSICA B-CONDENSED MATTER
Volume: 365
Issue: 1-4
起始頁: 141
結束頁: 146
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