Melting of the charge-ordering state by ruthenium doping in Ca0.6Pr0.4Mn1−yRuyO3 (y=0, 0.03, 0.05, 0.07) perovskites

Abstract Single-phase perovskite compounds Ca0.6Pr0.4Mn1−yRuyO3 (y=0, 0.03, 0.05, 0.07) were prepared by ceramic-technology method. Thermomagnetic plots, temperature dependence of resistivities, ac-susceptibilities of the produced samples were determined. The non-ruthenium doping (y=0) sample presents charge-ordering phenomenon at TCO=291 K. The experiment results show that the ruthenium doping destroys the charge ordering state, enhances ferromagnetism tendency and conductivity.