Critical behavior in the itinerant ferromagnet SmMn₂Ge₂

Transition metal and rare earth intermetallics have been a fertile playground for research of various quantum states. We report detailed magnetic studies on SmMn₂Ge₂, an anisotropic itinerant magnet with multiple magnetic phases. The critical behavior of the ferromagnetic phase transition is investigated by employing the modified Arrott plot with the Kouvel–Fisher method. The critical temperature T_C is determined to be around 342.7 K with critical exponents of β = 0.417 and γ = 1.122, and the interaction function is found to be J(r) ∼ r^−4.68, suggesting the coexistence of long-range and short-range magnetic interactions. Our results contribute to the understanding of complex magnetism in SmMn₂Ge₂, which may provide fundamental guidance in future spintronic applications.