LaBaMnO films produced by dip-coating on a quartz substrate

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 μm and the average grain size of this sample varies between 8 and 10 μm. La0.67Ba0.33MnO3 film showed a phase transition from paramagnetic to ferromagnetic at (TC) 130 K and a metal-insulator transition at (TMI) 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.