LaBaMnO films produced by dip-coating on a quartz substrate


GENÇER H., GÜNEŞ M., Goktas A., Babur Y., Mutlu H. I., ATALAY S.

JOURNAL OF ALLOYS AND COMPOUNDS, vol.465, no.1-2, pp.20-23, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 465 Issue: 1-2
  • Publication Date: 2008
  • Doi Number: 10.1016/j.jallcom.2007.10.110
  • Journal Name: JOURNAL OF ALLOYS AND COMPOUNDS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.20-23
  • Keywords: Manganite films, Colossal magnetoresistance, Strain effect, Coulomb blockade, MAGNETIC ENTROPY-CHANGE, PHASE-DIAGRAM, THIN-FILMS, MAGNETORESISTANCE, LA1-XBAXMNO3, MANGANITES, STRAIN
  • Akdeniz University Affiliated: No

Abstract

The electrical transport and magnetoresistance properties of the polycrystalline La0.67Ba0.33MnO3 film produced on a quartz substrate were investigated first time. X-ray powder diffraction indicated that film sample has perovskite structure. Scanning electron microscope indicated that La0.67Ba0.33MnO3 film thickness is approximately 20 mu m and the average grain size of this sample varies between 8 and 10 mu m. La0.67Ba0.33MnO3 film showed a phase transition from paramagnetic to ferromagnetic at (Tc) 130 K and a metal-insulator transition at (T-MI) 137 K at 2 mT magnetic field. The upturn of the resistance observed at low temperatures (<49 K) was attributed to the Coulomb blockade and the strong structural disorder due to the large lattice mismatch and strain relaxation. A large magnetoresistance ratio (MR(%)) of 230% was observed at 125 K and 6 T magnetic fields. (C) 2007 Elsevier B.V. All rights reserved.