Phase transitions, diffuse scattering and segregation kinetics in the colossal magnetoresistance material Pr 70Ca 30MnO 3
The successive phase transitions to the charge-ordered (CO), antiferromagnetic (AFM) and ferromagnetic (FM) states in Pr 70Ca 30MnO 3, as well as the enhancement of the FM state by the application of a magnetic field, have been studied using neutron diffraction. FM diffuse scattering that persists down to low temperatures indicates the existence of FM clusters. The relaxation process from a metastable FM to a CO and AFM state reveals percolative nature of the dramatic metal-to-insulator transition of this system. These results show that the system is phase-separated.