The variation of magnetic properties of La2/3Pb1/3MnO3 compounds with Co substitution for Mn

Abstract

The nominal compositions of La_2/3Pb_1/3Mn_1-xCo_xO₃ compounds has been substituted by Co for Mn at the concentrations of x = 0.05 and 0.10. The samples were prepared by solid-state reaction method. The results of X-ray diffraction showed all the fabricated samples were single-phase perovskites with a hexagonal structure. The phase transition temperature (TC) from ferromagnetic to paramagnetic states was determined by magnetization measurements depending on temperatures. It was found that the ferromagnetic-antiferromagnetic phase transition occurred on M(T) curves in the temperature range of T < TC. The saturated magnetic moments of the samples were determined from the curves M(H) with values of 3.42 μB and 3.40 μB for the samples of x = 0.05 and x = 0.10, respectively at T = 5K. The curves of M(H) were well fitted with the function of M = Ms (1-a/Hⁿ ).