Magnetic properties and critical behavior of the perovskite manganite La0.825Sr0.175MnO3.

Polycrystalline La 0.825 Sr 0.175 MnO 3 was prepared by solid state reaction method. It exhibits a ferromagnetic–paramagnetic phase transition at T C ∼ 286 K. The intrinsic magnetic properties were clarified by the scaling theory and the isothermal magnetization measured around T C. Based on the modified Arrott plot, Kouvel–Fisher method and Widom relation, the critical exponents are determined to be β = 0. 308 (7) , γ = 1. 065 (8) , δ = 4. 457 (17). Normalization of the critical exponents shows that the extended exchange interaction decays with J ∼ r − 4. 861 , consistent with Tricritical mean field model. Rhodes–Wohlfarth ratio P C / M S >1 suggests that La 0.825 Sr 0.175 MnO 3 is completely itinerant ferromagnet. [Display omitted] • La 0.825 Sr 0.175 MnO 3 shows FM–PM phase transition at 286 K. • Its critical exponents (β = 0.308, γ = 1.065) were determined by the scaling theory. • Its phase transition belongs to Tricritical mean field model. [ABSTRACT FROM AUTHOR]