Pressure Tuning Of The Anomalous Hall Effect In The Chiral Antiferromagnet Mn3ge

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 = 1.53 GPa. Even though the Hall conductivity changes sign upon increasing pressure, the room-temperature saturation value of 23 Omega(-1) cm(-1) at 2.85 GPa is remarkably high and comparable to the saturation value at ambient pressure of about 40 Omega(-1) cm(-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.