Observation of an Anomalous Hall Effect in Single-crystal Mn3Pt

Abstract

The Mn3X family of compounds was the first in which a large anomalous Hall effect (AHE) was predicted to arise from a purely antiferromagnetic structure, due to the Berry curvature in momentum space. Nearly simultaneously with this prediction, a large AHE was observed experimentally in one of the hexagonal members of this family, Mn3Sn. Aligning antiferromagnetic domains, a necessary step for observation of the AHE, is more challenging for the cubic members of the Mn3X family, due to a combination of a smaller spontaneous ferromagnetic moment and much stronger magnetic anisotropy. Here, we use a combination of uniaxial stress and applied magnetic field to align domains of bulk single-crystal Mn3Pt, and demonstrate for the first time a substantial AHE in a bulk sample of a cubic member of the Mn3X family. The AHE remains locked in with essentially no quantitative variation when the stress is ramped back to zero, which shows that it is not a consequence of any stress-induced ferromagnetic moment.

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• Non-collinear Antiferromagnets and the Anomalous Hall Effect
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• Effect of Applied Orthorhombic Lattice Distortion on the Antiferromagnetic Phase of CeAuSb${}_2$
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• Strain-tunable anomalous Hall effect in hexagonal MnTe
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• Hall mass and transverse Noether spin currents in noncollinear antiferromagnets
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