Influence of Fe Doping at B Site upon Electric and Magnetic Properties of LaMnO_3 System

By measuring M-T curves,ESR curves,ρ-T curves and MR-T curves of the samples, the influences of Fe doping (x=0.05,0.10,0.20,0.30,0.40) upon magnetic and electric properties of LaMnO_3 were studied.The experimental results indicate that all samples undergo the transition from paramagnetism to ferromagnetism at T_C.For the doped samples,there is a paramagnetic-ferromagnetic (PM-FM) transition but there is no insulator-metal(IM) transition.The results are attributed to double exchange interaction between Fe~(3+) ions and Mn~(3+) ions and Jahn-Teller effects.