Abstract
Abstract The critical properties of La 0.8 Ba 0.2 Mn 1− x Fe x O 3 polycrystalline samples near ferromagnetic–paramagnetic phase transition temperature have been investigated by analyzing isothermal magnetization data. Experimental results revealed that all samples exhibit a second-order magnetic phase transition. Dc-magnetization data near the transition temperature have been analyzed with the help of the modified Arrott plot, Kouvel–Fisher method. The value of critical exponents, derived from the magnetization data using the Kouvel–Fisher method, yield 0.370 ± 0.02 ⩽ β ⩽ 0.379 ± 0.01, 1.359 ± 0.02 ⩽ γ ⩽ 1.392 ± 0.03 and 4.40 ± 0.0 ⩽ δ ⩽ 4.67 ± 0.01with a T C of 125 ± 0.02–157.50 ± 0.02 K. The exponent values are close to those expected for three-dimensional (3D) Heisenberg ferromagnets which is short-range magnetic interaction.
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