Structure, magnetic, magnetocaloric and magnetoresistance propreties of Pr1-xPbxMnO3 perovskites

Abstract

In our previous work, we have studied structure and properties of La1-xPbxMnO3 perovskites. Variation of doping content leads to alternating structure and magnetic properties of materials. In this paper, the investigation of structure, magnetic, magnetocaloric and magnetoresistance properties of family Pr1-xPb xMnO3 (x=0.1-0.5) is presented. The grain size of samples increases with Pb content. The FC and ZFC thermomagnetic curves measured at low field and low temperatures exhibit the spin-glass-like behavior. The magnetic entropy changes, |??Sm(T)|, were determined and showed belong to GMCE. The resistance measurements indicated that first two samples exhibited semiconducting conductivity in the whole measured temperature range, whereas in the rest of samples there is insulator-metallic transition on R(T) curves. Magnetoresistance measurements have also been performed. ?? 2006 Elsevier B.V. All rights reserved.