Abstract
The critical properties of the electron-doped manganite La0.7Sr0.25Na0.05Mn(1-x)TixO3 (x=0.0 and 0.1) were investigated based on the data of static magnetization measurements around Curie temperature T-C. Various techniques such as modified Arrott plot, a Kouvel Fisher method, and critical isotherm analysis were used to determine the values of the ferromagnetic transition temperature T-C, as well as the critical exponents of beta, gamma and delta. The estimated results are close to those expected for three-dimensional Heisenberg class with short-range interaction. From the field dependence of RCP and Delta S-M, it was possible to evaluate the critical exponents of the magnetic phase transitions. Their values are in good agreement with those obtained from the critical exponents using a modified Arrott plot (MAP). (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.