Abstract
The La0.7-xPrxBa0.3MnO3 (x=0.00, 0.1, 0.2) polycrystalline samples were prepared by solid-state reaction and their crystallographic structure was achieved by XRD patterns analysis. Magnetization measurements were performed versus temperature and applied magnetic held to investigate magnetic properties such as critical behavior near T-c. Analysis in the vicinity of the ferromagnetic (FM)-paramagnetic phase-transition temperature evidences a second-order phase transition. Saturation magnetization and the initial susceptibility versus temperature are found to obey asymptotic relations. Using modified Arrott plot, Kouvel-Fisher method and critical isotherm analysis, the critical parameters (T-C, beta, gamma, and delta) are determined in the two characteristic regions of low- and high-magnetic fields. The estimated critical exponents are close to both 3D-Heisenberg and mean field model values. The reliability of the critical exponent values was confirmed by the Widom scaling relation and the universal scaling hypothesis. The change in the universality class should be due to the increase of Pr content. (C) 2013 Elsevier B.V. All rights reserved