A Topological Kagome Magnet in High Entropy Form

Topological kagome magnets RMn₆Sn₆ (R = rare earth element) attract numerous interests due to their non-trivial band topology and room-temperature magnetism^[1]. On the other hand, increasing attention is focused on the magnetic properties of high entropy materials, as the coexistence of multiple magnetic elements is expected to generate unconventional complex magnetic orderings. However, the study on single crystalline high entropy topological magnets is still lacking.

In this talk, we report a high entropy version of topological kagome magnet, (Gd_0.38Tb_0.27Dy_0.20Ho_0.15)Mn₆Sn₆. Such a high entropy material exhibits multiple spin reorientation transitions, which is different from all the related parent compounds and can be understood in terms of competing magnetic interactions enabled by the high entropy effect. Furthermore, we also observed an intrinsic anomalous Hall effect, indicating that the high entropy phase preserves the non-trivial band topology. These results suggest that high entropy may provide a route to engineer the magnetic structure without breaking the band topology, and expand the horizon of topological materials. 

[1] Yin, J.-X. et al. Quantum-limit Chern topological magnetism in TbMn₆Sn₆. Nature 583, 533–536 (2020).