Single crystals of $R{\mathrm{Rh}}_6{\mathrm{Ge}}_4$ ($R$ = Pr, Nd, Sm, Gd–Er) were synthesized using a Bi flux and their physical properties were characterized by magnetization, resistivity, and specific heat measurements. These compounds crystallize in the noncentrosymmetric ${\mathrm{LiCo}}_6{\mathrm{P}}_4$-type structure (space group $P\overline{6}m2$), where rare-earth atoms form a triangular lattice in the $ab$ plane and chains along the $c$ axis. ${\mathrm{PrRh}}_6{\mathrm{Ge}}_4$ and ${\mathrm{ErRh}}_6{\mathrm{Ge}}_4$ do not exhibit magnetic transitions above 0.4 K. ${\mathrm{NdRh}}_6{\mathrm{Ge}}_4$ and ${\mathrm{SmRh}}_6{\mathrm{Ge}}_4$ are ferromagnets, while ${\mathrm{GdRh}}_6{\mathrm{Ge}}_4$ and ${\mathrm{DyRh}}_6{\mathrm{Ge}}_4$ show antiferromagnetic transitions, whereas ${\mathrm{HoRh}}_6{\mathrm{Ge}}_4$ is a ferrimagnet. In addition, ${\mathrm{DyRh}}_6{\mathrm{Ge}}_4$ shows multiple transitions and magnetization plateaus when a magnetic field is applied along the $c$ axis. In ${\mathrm{SmRh}}_6{\mathrm{Ge}}_4$, like the Ce counterpart, the crystalline-electric field effect leads to an easy plane anisotropy, while in other compounds it gives rise to a pronounced uniaxial anisotropy.

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• Antiferromagnetism
• Ferrimagnetism
• Ferromagnetism
• Magnetic anisotropy
• Magnetic order
• Magnetic susceptibility
• Phase diagrams
• Rare-earth magnetic materials
• Magnetization measurements
• Resistivity measurements
• Specific heat measurements