Single crystal growth and characterization of 166-type magnetic Kagome metals

Kagome magnets were predicted to be a good platform to investigate correlated topology band structure, Chern quantum phase, and geometrical frustration since their unique lattice geometry. Here we reported single crystal growth of 166-type Kagome magnetic materials, including HfMn6Sn6, ZrMn6Sn6, GdMn6Sn6 and GdV6Sn6, by using flux method with Sn as a flux. Among them, HfMn6Sn6 and ZrMn6Sn6 single crystals were grown for the first time. X-ray diffraction measurements reveal that all four samples crystallized in HfFe6Ge6-type hexagonal structure with space group of P6/mmm. All samples show metallic behavior from temperature dependence of resistivity measurements, and the dominate carrier is hole, except for GdV6Sn6 which is electron dominated. All samples have magnetic order with different transition temperature, HfMn6Sn6, ZrMn6Sn6 and GdV6Sn6 are antiferromagnetic with the T N of 541 K, 466 K and 4 K respectively, while GdMn6Sn6 is ferrimagnetic with the critical temperature about 470 K. This study will enrich the research platform of magnetic Kagome materials and help explore the novel quantum phenomenon in these interesting materials.