The magneto-transport properties of epitaxial La0.7Sn0.3MnO3 manganite thin films

• DOI: 10.1016/j.physb.2005.05.007
• Publication Date: 2005-06-14T11:25:42Z
• Authors: T.Y. Cheng; C.C. Hsieh; J.Y. Juang; J.-Y. Lin; K.H. Wu; T.M. Uen; Y.S. Gou; C.H. Hsu
• Keywords: 02 engineering and technology; 0210 nano-technology

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 150 K. Ex situ annealing of the films at 850 °C in 250 Torr oxygen for 4 h, nonetheless, not only significantly improves the crystallographic quality but also raises IMT and PFT at 315 K and 320 K, 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 e g band of Mn.