抄録
Magnetotransport properties were investigated for a crystal of perovskite-type manganese oxide, Pr1-xCaxMnO3 (x=0.3). The single-crystal compound is insulating and below 220, K shows the charge-ordering of Mn3+ and Mn4+ species. Application of a magnetic field (>20, kOe) changes a canted antiferromagnetic insulating state into a ferromagnetic metallic state accompanied by change of resistivity by several orders of magnitude. At low temperatures, e.g., <50, K, the hysteresis of the transition field is pronounced and the field-induced insulator-to-metal transition becomes irreversible.
