The magneto-transport properties of epitaxial La0.7Sn 0.3MnO3 manganite thin films

T. Y. Cheng*, C. C. Hsieh, Jenh-Yih Juang, Jiunn-Yuan Lin, Kaung-Hsiung Wu, T. M. Uen, Y. S. Gou, C. H. Hsu

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

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 eg band of Mn.

Original languageEnglish
Pages (from-to)141-146
Number of pages6
JournalPhysica B: Condensed Matter
Volume365
Issue number1-4
DOIs
StatePublished - 1 Aug 2005

Keywords

  • Magnetoresistance
  • Spin glass
  • Strain relaxation

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