The kagome-lattice compounds $R{\mathrm{Mn}}_6{\mathrm{Sn}}_6$ ($R$ is a rare-earth element), where the Mn atoms form a kagome net in the basal plane, are currently attracting a great deal of attention as they have been shown to host complex magnetic textures and electronic topological states strongly sensitive to the choice of the $R$ atom. Among the magnetic $R$ atoms, ${\mathrm{TmMn}}_6{\mathrm{Sn}}_6$ orders with the easy-plane magnetization forming a complex magnetic spiral along the $c$ axis. Previous neutron studies carried out on polycrystalline samples found that Ga doping changes the magnetic anisotropy from easy-plane to easy-axis. Here we present magnetic and magnetotransport measurements on a single crystal and first-principles calculations in the doping series of ${\mathrm{TmMn}}_6{\mathrm{Sn}}_{6-x}{\mathrm{Ga}}_x$. We find that the magnetic properties are highly sensitive even to a small concentration of Ga. With minimal Ga substitution, the easy-plane anisotropy is maintained, which gradually changes to the easy-axis anisotropy with increasing Ga. We discuss these observations with respect to the effect of Ga doping on magnetocrystalline anisotropy and Tm crystal field.

Close

PrevNext

View figure in article

• Electrical conductivity
• Electronic structure
• Electronic structure of atoms & molecules
• First-principles calculations
• Magnetism
• Methods in magnetism
• Topological materials