Abstract
We have studied the magnetoresistivity, thermoelectric power, and magnetic susceptibility of lanthanum manganite LaMnO3+x with different γ-Mn2O3 contents at 77–300 K. The specimens were obtained by high-temperature direct synthesis of lanthanum and manganese oxides. For all the specimens, we established ferromagnetic ordering with Curie point 220–245 K, accompanied by appearance of negative magnetoresistivity, catastrophic growth of magnetic susceptibility, and semiconductor conductivity. The maximum negative magnetoresistivity (δH ≈ −13%) is characteristic for two-phase samples with the lowest oxygen content.
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