We report the magnetic and transport properties of ${\mathrm{CeMn}}_{0.84}{\mathrm{Sb}}_2$ measured on single-crystal samples as well as the magnetic structures determined by neutron diffraction using a powder sample. The results of magnetic and transport measurements below room temperature show that ${\mathrm{CeMn}}_{0.84}{\mathrm{Sb}}_2$ exhibits metallic conduction and undergoes three magnetic transitions at $T_1,T_2$, and $T_3$, where $T_1>T_2>T_3$, indicating the existence of three distinct magnetic phases (I, II, and III). The magnetization and the magnetoresistance effect exhibit characteristic behaviors that can be ascribed to field-induced magnetic transitions. The results of powder neutron diffraction indicate the formation of antiferromagnetic orders with a propagation vector of (0, 0, 1/2) below $T_1$. Rietveld refinements reveal that the Mn moments align along the $c$ axis at 160 K (phase I) and cant toward the $ab$ plane at lower temperatures (phase II). With a further decrease in the temperature, both Mn and Ce moments order in phase III.

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• Magnetism
• Phase diagrams
• Antiferromagnets
• Magnetization measurements
• Neutron scattering