Magnetic and electron transport properties in polycrystalline La_(0.7)Sr_(0.3)M_nO_3

摘要

Magnetic and electron transport properties of polycrystalline La_(0.7)Sr_(0.3)M_nO_3 bulk samples have been investigated. Tc in as-sintered samples decreases with increase in sintering temperature, while Tc does not change in the annealed samples. Metal-insulator transition near Tc is not observed in as-sintered samples, hut is observed in annealed samples. Especially the electron transport properties in the sample annealed at 1373K are similar to that of single crystal.