Electromagnetic Properties of Lanthanum Manganese Oxides Doped with Iron

摘要

The mechanism of GMR effects in La(Mn_(1-x)Fe_x)O_3, (x = 0, 0.01, 0.03) oxides has been investigated by means of magnetic measurements, resistivity measurements in magnetic field and Moessbauer spectroscopy. For the x = 0.01 sample, the GMR behavior is similar to that of the conventional (La, A)MnO_3 (A: divalent cations) oxides. For the x = 0.03 sample, even though the temperature dependence of the Moessbauer spectra was similar to that of the x = 0.01 sample, the mechanism for the occurrence of the GMR effect seems to be different. The x = 0 sample shows a similar behavior to the x = 0.03 sample. A thermal stabilization of spin fluctuation is proposed for the x = 0 and x = 0.03 sample.