We report on a detailed study of the electrical resistivity and the magnetoresistance of the (La0.67Ca0.33MnO3)0.97/(ZnO)0.03 (LCMO/ZNO) composite prepared at different sintering temperature by conventional solid state reaction method. The results of scanning electron microscopy indicate that ZnO segregates mostly at the grain boundaries of LCMO. The grain size of the LCMO increases with the sintering temperature. The X-ray diffraction (XRD) result shows that no new phase appeared in the composite except LCMO and ZnO phases. The magnetic and electrical transport was measured over a temperature range of 90-320 K. All samples exhibits characteristic insulator-metal and para-ferromagnetic transition temperature, which decreases with increase in sintering temperature. It is very interesting to note that the MR% is enhanced with the sintering temperature, which is encouraging for potential applications.

Keywords: Composites, Sintering temperature, Grain size, Curie temperature, Magnetoresistance