Critical Behavior Near the Paramagnetic to Ferromagnetic Phase Transition Temperature in Polycrystalline La0.57Nd0.1Sr0.33Mn1−x Al x O3 (0.0≤x≤0.1)

摘要

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 T C 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.