The magnetic properties of the Tb-honeycomb lattice compound ${\mathrm{TbPt}}_6{\mathrm{Al}}_3$, which crystallizes in the ${\mathrm{NdPt}}_6{\mathrm{Al}}_3$-type trigonal structure, have been studied by the measurements of electrical resistivity, magnetization $M\left(T,B\right)$, and specific heat on single-crystalline samples. The magnetic susceptibility, $M\left(T\right)/B$, for $B\parallel c=0.1\mathrm{T}$ shows a cusp at $T_{\mathrm{N}}=3.5\mathrm{K}$, in which temperature decreases with increasing the magnitude of $B\parallel c$, while $M\left(T\right)/B$ for $B\parallel a=0.1$ T remains constant with decreasing temperature below $T_{\mathrm{N}}$. This anisotropic behavior suggests a collinear antiferromagnetic (AFM) order of the $\mathrm{T}{\mathrm{b}}^{3+}$ moments pointing along the $c$ axis. The data of $M\left(T\right)/B$ for $T>10\mathrm{K}$ on the single crystal and that of inelastic neutron scattering from powdered samples have been simultaneously analyzed using the crystal field model. The analysis reveals the non-Kramers doublet ground state for the $\mathrm{T}{\mathrm{b}}^{3+}$ ion under the trigonal crystal field. The neutron powder diffraction measurement shows that the collinear AFM structure with a magnetic propagation vector $\mathbf{k}=\left[0,0,0\right]$ is associated with moments of $5.1{\mu }_{\mathrm{B}}/\mathrm{Tb}$ pointing along the $c$ axis. Comparison of the magnetic point group with the nontrivial spin Laue group indicates that ${\mathrm{TbPt}}_6{\mathrm{Al}}_3$ is classified into bulk $g$-wave altermagnets.

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• Altermagnetism
• Magnetic anisotropy
• Altermagnets
• Crystal growth
• Magnetization measurements
• Neutron techniques
• Transport techniques