Completing the triad: synthesis, structure, and magnetic properties of kagome metals Ti3Mn3Sn4Ga and Hf3Mn3Sn4Ga

Abstract

Single crystals of Mn-based kagome metals Ti₃Mn₃Sn₄Ga and Hf₃Mn₃Sn₄Ga were grown from Sn flux. The X-ray structural analysis showed that the two compounds are isostructural to recently reported Zr₃Mn₃Sn₄Ga and feature a kagome lattice of Mn linear chains linked by Sn atoms. The structural analysis also revealed noticeable changes in the interatomic distances, primarily T–Sn ones, originating from differences in atomic radii of T = Ti, Zr, and Hf. Ti₃Mn₃Sn₄Ga and Hf₃Mn₃Sn₄Ga showed magnetic ordering at 110 K and 160 K, respectively, which is higher than that reported for Zr₃Mn₃Sn₄Ga. While Hf₃Mn₃Sn₄Ga demonstrates antiferromagnetic ordering below the transition temperature, Ti₃Mn₃Sn₄Ga displays a small uncompensated moment directed along the c axis (0.02μ_B per Mn at 2 K), and exhibits several characteristic features of a spin-glass state, including sensitivity to the magnetic history of a sample and a pronounced shift of the magnetic hysteresis if cooled with the field.