Abstract
Structural and critical behaviors of both La0.47Eu0.2Pb0.33MnO3 (LEPMO) and La0.47Y0.2Pb0.33MnO3 (LYPMO) perovskite samples have been investigated in this work. Rietveld refinements of X-ray diffraction patterns show that samples are single phase and crystallize in the orthorhombic system with Pnma space group with unit cell volume and crystalline domain size higher for LEPMO than LYPMO. Arrott plots show a second-order phase transition for both compounds. The critical properties near ferromagnetic-paramagnetic phase transition have been analyzed from data of static magnetization measurements near TC through various techniques. The estimated critical exponents β, γ and δ for our samples are close to the theoretical prediction from the 3D-Ising model with value of β lower (respectively, γ and δ higher) for LEPMO than LYPMO compound. This can be related to the reduction of the double exchange coupling of Mn3+–O2−–Mn4+ and the reduction of the crystalline domain size when replacing Eu by Y in La0.47Eu0.2Pb0.33MnO3 system.
•LEPMO and LYPMO perovskite samples exhibit a second order PM - FM phase transition at TC.•The estimated critical exponents are close to those expected for 3D-Ising for both samples.•Critical exponent β is lower (respectively, γ and δ are higher) for LEPMO than LYPMO compound.•The change of the critical behavior for our samples is due to the nature of rare earth element-doping.