Abstract
The critical parameters provide important information concerning the interaction mechanisms near the paramagnetic to ferromagnetic transition. In this paper, we have investigated the effect of non-magnetic aluminum Al doping in Mn-site on the critical behavior in La0.57Nd0.1Sr0.33MnO3 compounds using magnetization methods near the Curie temperature TC through various techniques such as modified Arrott plot, Kouvel–Fisher method, and critical isotherm analysis. The values of critical exponents, derived from the magnetic data yield 0.326 ≤β≤0.366,1.265≤γ≤1.342 and 4.13 ≤δ≤5.07. The critical exponents found in this study obey the Widom scaling relation δ=1+γ/β, implying that the obtained values of β and γ are reliable. Experimental results have revealed that the samples exhibited the second-order magnetic phase transition with exponents which match well with those predicted for the three-dimensional Heisenberg (3D) around the critical temperature.
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