Influence of Fe doped manganite on critical behavior of La0.6Nd0.1(Ca,Sr)0.3Mn1−xFexO3

Abstract

The samples of manganese perovskite La0.6Nd0.1(Sr,Ca)0.3Mn1−xFexO3 (x=0.0, 0.05 and 0.1) were prepared by a solid–solid method and all of them achieved an orthorhombic perovskite structure, revealed by X-ray diffraction. Investigations into temperature and magnetic-field dependences of magnetization indicated a gradual decrease of the ferromagnetic–paramagnetic transition temperature (TC) from 326 to 296K with increasing Fe-doping. The experimental results revealed that all the samples were undergone a second-order phase transition. The critical properties near ferromagnetic–paramagnetic phase transition temperature have been analyzed from data of static magnetization measurements for the samples, using various techniques such as a modified Arrott plot (MAP), Kouvel–Fisher (KF) method and critical isotherm (CI) analysis. Critical exponents for x=0.0 and x=0.05 samples are close to the theoretical prediction from the 3D-Heisenberg and for x=0.1sample the values obtained for the critical exponents are close to those predicted by the tri-critical mean-field.