Abstract
The critical properties of the manganese perovskite La0.67Ba0.22Sr0.11Mn1−x Fe x O3 (0 ≤ x ≤ 0.2) around the paramagnetic (PM)–ferromagnetic (FM) phase transition were investigated using modified Arrott plots and Kouvel–Fisher method based on the data of static magnetic measurements recorded around the curie temperature T C. Based on the evaluated critical exponents for the compounds with different x values (0.378 ≤ β ≤ 0.411, 1.247 ≤ γ ≤ 1.393, and 4.018 ≤ δ ≤ 4.73) we concluded that the PM–FM phase transition in the compound with x = 0 belongs to the three-dimensional Heisenberg universality. However, the substitution of Fe3+ for Mn3+ resulted in shifting the value of γ toward the 3D-Ising model value and a slight increase in β. This behavior was discussed and correlated with the random distribution of Fe3+ at the Mn3+ sites and the consequent suppression the double exchange interaction.
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