The substitution at the Mn site of various transitional metal elements dramatically modifies the magnetic and electronic properties of the La 0.7Pb 0.3Mn 0.8Me 0.2O 3 (Me=Ni, Co, and Fe) manganites. The powder x-ray diffraction pattern shows a single-phase rhombohedral distorted perovskite structure with space group R3̄c (No. 167) for all samples. The present article is focused on the effects induced by the partial substitution of Ni, Co, and Fe for the Mn site. The field cooled-zero field cooled curves indicate that the magnetic order is modified from a ferromagnetic long-range spin order for La 0.7Pb 0.3MnO 3 to a spin cluster induced short-range spin order for all the doped compositions. The saturation magnetization, transition temperature, and resistance peak temperature decrease significantly from Ni-doped, Co-doped, to Fe-doped composition. In conclusion, the variation of the magnetic and electronic behaviors is due to the dissimilar 3d electron configuration of the substitutions.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)