Gustavo Lombardi
The hexagonal Heusler compound Mn3Ge exhibits an antiferromagnetic structure with the Mn spins arranged in a 120ยบ triangular configuration characteristic of a Kagome lattice in the plane. These Kagome layers are periodically stacked along the axis. This structure generates a large anomalous Hall effect (AHE) due to a non-vanishing Berry curvature. Here we show that uniaxial stress provides an effective method for tuning the AHE in Mn3Ge. Our results reveal that by inducing a distortion in the plane, the Hall signal is significantly modified. In contrast, stress applied perpendicular to the plane has no visible effect on the Hall signal. These results, combined with previous hydrostatic pressure data [2], suggest that the strong variations in the AHE are due to in-plane changes in the magnetic order. We also find that the application of hydrostatic pressure and uniaxial stress leads to different modifications of the magnetic order, the former inducing an out-of-plane tilt of the Mn spins, while the latter induces in-plane rotations of the Mn spins.
[1] G. A. Lombardi et al., Phys. Rev. Mater. 9, 104204 (2025).
[2] R. D. Dos Reis et al., Phys. Rev. Mater. 4, 51401 (2020).