Critical properties in single crystals of Pr1-xPbxMnO3

The critical properties at the ferromagnetic-paramagnetic transition have been analyzed from data of static magnetization measurements on single crystals of Pr1-xPbxMnO3 for x=0.23 and x=0.30. In Pr1-xPbxMnO3, the ferromagnetic ordering and the metal-insulator transition do not coincide in parts of the phase diagram. The crystal with x=0.23 is a ferromagnetic insulator with Curie temperature T-C=167 K, while the crystal with x=0.30 has T-C=198 K and remains metallic up to a metal-insulator transition temperature T-MI=235 K. The dc magnetization measurements were carried out in the field range from 0 to 5 T for an interval in the critical temperature range T-C +/- 10 K corresponding to a reduced temperature interval 0.003