Pressure tuning of the anomalous Hall effect in the chiral antiferromagnet Mn3Ge

Abstract

We report on the pressure evolution of the giant anomalous Hall effect (AHE) in the chiral antiferromagnet Mn3Ge. The AHE originating from the nonvanishing Berry curvature in Mn3Ge can be continuously tuned by application of hydrostatic pressure. At room temperature, the Hall signal changes sign as a function of pressure and vanishes completely at p=1.53GPa. Even though the Hall conductivity changes sign upon increasing pressure, the room-temperature saturation value of 23ω-1cm-1 at 2.85 GPa is remarkably high and comparable to the saturation value at ambient pressure of about 40ω-1cm-1. The change in the Hall conductivity can be directly linked to a gradual change of the size of the in-plane components of the Mn moments in the noncollinear triangular magnetic structure. Our findings, therefore, provide a route for tuning of the AHE in the chiral antiferromagnetic Mn3Ge. © 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.