Abstract
The critical behavior of La0.5Ca0.4Te0.1MnO3 compound is investigated based on the data of static magnetic measurements in the vicinity of its critical temperature TC. The estimated critical exponents for La0.5Ca0.4 Te0.1MnO3 are found to be 3D-Ising model (β = 0.343 and γ = 1.261 at an average TC = 260 K through various techniques such as modified Arrott plot (MAP), Kouvel–Fisher (KF) method and critical isotherm analysis (CIA). The reliability of the critical exponents’ values was confirmed by the Widom scaling relation (WSR) and the universal scaling hypothesis. We noted that the critical exponents γ are almost similar to the value of the mean-field theory which can be explained by the existence of a long-range dipole–dipole interaction. Following the Harris criterion, we deduced that the disorder in our case is relevant, which could be the cause of the change in the universality class.The magnetic phase transition and the magnetic entropy change (−ΔSm) in the La0.5Ca0.4 Te0.1MnO3 manganite is investigated by measuring the magnetization as a function of temperature. By investigating the field dependence of RCP and (−ΔSm), 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 by Widom scaling relation (WSR) using the modified Arrott and Kouvel–Fisher methods.
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