Structural, thermodynamic, and electrical transport properties of TbAuPb were investigated on single crystals. The compound was found to crystallize with the cubic MgAgAs-type structure characteristic of half-Heusler materials. It orders antiferromagnetically at $T_{\mathrm{N}}=5\mathrm{K}$ and undergoes a transition into a different antiferromagnetic phase emerging in high magnetic fields. Electrical transport in TbAuPb exhibits a multiband character, with a predominance of hole-like carriers. Angular magnetoresistance evolves systematically with applied magnetic field and changes its symmetry near the spin-reorientation transition, highlighting strong coupling between the charge transport and the magnetic order. The results of first-principles calculations indicate that TbAuPb is a band inverted semimetal in the nonmagnetic state, which becomes topologically trivial in the field-induced ferromagnetic state.

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• Electrical conductivity
• Electrical properties
• Hall effect
• Magnetic order
• Magnetotransport
• Specific heat
• Antiferromagnets
• Metals
• Rare-earth magnetic materials
• Single crystal materials
• Crystal growth
• Density functional theory
• First-principles calculations
• Resistivity measurements