Analysis of the Effect of Temparature on the Resistivity of Nanocrystalline La0.7 Ba0.3MnO3 Powders

Abstract

A Systematic investigation on structural, electrical, microstructure and compositions properties of La0.7Ba0.3MnO3 powder, prepared by a standard solid state reaction method, has been undertaken. The XRD pattern showed that the as prepared LBMO material was in single-phase rhombohedral structure. The electrical properties of as grown powders were carried out using standard four probe technique. The influence of dc biasing current on temperature dependence of resistance of La0.7Ba0.3MnO3 powder was reported. From electrical data it was observed that the electrical resistance decreased with bias current indicating the alignment of spins and increase in spin stiffness coefficient and decreasing the resistance at metal-insulator transition temperature (TMI). The surface morphology of the samples was studied by scanning electron microscope. From scanning electron micrographs, granular features were observed with average grain size of ~20nm.