التفاصيل البيبلوغرافية
| العنوان: |
The magneto-transport properties of epitaxial La0.7Sn0.3MnO3 manganite thin films |
| المؤلفون: |
Cheng, T.Y.1 melin.ep89g@nctu.edu.tw, Hsieh, C.C.1, Juang, J.Y.1, Lin, J.-Y.2, Wu, K.H.1, Uen, T.M.1, Gou, Y.S.1, Hsu, C.H.3 |
| المصدر: |
Physica B. Aug2005, Vol. 365 Issue 1-4, p141-146. 6p. |
| مصطلحات موضوعية: |
*THIN films, *SURFACES (Technology), *SOLID state electronics, *OXIDE minerals |
| مستخلص: |
Abstract: 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 150K. Ex situ annealing of the films at 850°C in 250Torr oxygen for 4h, 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 post-annealed 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 band of Mn. [Copyright &y& Elsevier] |
| قاعدة البيانات: |
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