The structure and magnetotransport properties of La2/3Sr1/3MnO3/Ba(La)TiO3 composites

Abstract The effect of Ba(La)TiO 3 doping on the structure and magnetotransport properties of La 2/3 Sr 1/3 MnO 3 (LSMO)/ x Ba(La)TiO 3 ( x =0.0, 1.0, 5.0 mol%) have been investigated. The X-ray diffraction patterns and microstructural analysis show that BaTiO 3 and LSMO phases exist independently in BaTiO 3 -doped composites. The metal–insulator transition temperature ( T MI ) decreases whereas the maximum resistivity increases very quickly by the increase of BaTiO 3 doping level. The partial substitution of Ba by La(0.35 mol%) results in a decrease in resistivity of LSMO/ x Ba(La)TiO 3 composites. Magnetoresistance of BaTiO 3 -doped composites decreases monotonously in the temperature range 200–400 K in a magnetic field of 5 T, which is completely different from that of LSMO compound. The value of MR decreases at low field ( H H >1 T) with increasing the BaTiO 3 doping level at low temperatures below 280 K. These investigations reveal that the magnetotransport properties of LSMO/ x Ba(La)TiO 3 composites are dominated by spin-dependent scattering and tunneling effect at the LSMO/BaTiO 3 /LSMO magnetic tunnel junction.