Sm₂Ru₃Sn₅: A Noncentrosymmetric Cubic Member of the Ln₂M₃X₅ Family

An optimized synthetic method is presented for Sm₂Ru₃Sn₅ and investigate its physical properties and electronic structure. Sm₂Ru₃Sn₅ is prepared by arc-melting stoichiometric ratios of the elements and is confirmed by single crystal and powder X-ray diffraction. An antiferromagnetic transition is observed at T_N = 3.8 K. A modified Curie-Weiss fit to the data in the range 50–150 K yields a Curie-Weiss temperature: θ_CW = −36.6 K and an effective magnetic moment: μ_eff = 0.83 μ_B, in agreement with a Sm³⁺ oxidation state. Field-dependent magnetization up to H = 7 T at 2 K shows a maximum response of 0.06 μ_B, which is significantly lower than the expected Sm³⁺ saturation moment (0.71 μ_B). Resistivity measurements indicate metallic behavior, and analysis of the magnetic entropy from the heat capacity reveals a doublet ground state due to crystal electric field splitting. The electronic structure and density of states are calculated with density function theory and further supported by the local density approximation with dynamical mean-field theory. The experimental and computational results highlight localized Sm³⁺ moments and suggest a possible interplay between Ruddelman–Kitel–Kasuya–Yosida and Kondo interactions, positioning Sm₂Ru₃Sn₅ as a promising material for studying topology and complex physical phenomena.