Abnormal magnetization and field-induced transition in (La0.73Bi0.27)0.67Ca0.33MnO3

The magnetic field dependence of magnetization of Bi doped manganites (La1−xBix)0.67Ca0.33MnO3 (x=0.27) was investigated at different temperatures with a pulsed high magnetic field. A metamagnetic transition was observed in the magnetization measurement, which revealed the coexistence of charge ordering (CO) and ferromagnetic (FM) phases. With decreasing magnetic field, the field-induced FM phases remained stable even when the magnetic field decreased to zero. This result suggests that ferromagnetic interactions are enhanced due to the effect of the pulsed high magnetic field, which makes the doped manganites a good system for magnetoresistance materials.