Large negative magnetoresistance (NMR) has attracted tremendous attention for its unique performance in spin electronics. Up to now, most of the mechanisms proposed to explain NMR are only effective in limited systems. In an antiferromagnetic EuMgPb single crystal, we observed a large NMR up to −24% at 14 T, 10 K, excluding contributions from weak localization, chiral anomaly, and magnetic scattering. Supported by first-principles calculations, we propose that the deformation in the Fermi surface of the antiferromagnetic ground state, resulting from the breaking $\mathcal{P}\mathcal{T}$ symmetry under magnetic field, primarily contributes to NMR. In this way, we provide a general mechanism for NMR that is suitable for various materials in nondisordered antiferromagnetic systems.

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• Antiferroelectricity
• Density of states
• Electrical conductivity
• Electrical properties
• Electronic structure
• Fermi surface
• Magnetoresistance