Electrical Transport Behavior and Magnetoresistance Properties of (1-x)La_(2/3)Ca_(1/3)MnO_3/xSb_2O_5 Composites

The composites with the nominal composition of (1 - x)La2/3Ca1/3MnO3/xSb2O5 were fabricated. The study of temperature dependence of resistivity at zero field shows that the metal-insulator transition temperature (Tp) and the resistivity of the composites are dependent on Sb2O5 addition level x. When x 3%, Tp shifts towards low temperature and resistivity increases with the increase of x. But Tp shifts towards high temperature and resistivity decreases with further increasing of x. The measurement for temperature dependence of magnetoresistance (MR) indicates that MR effect can be largely enhanced in the composites with small Sb2O5 addition.