Large anomalous Hall effect driven by a nonvanishing Berry curvature in the noncolinear antiferromagnet Mn 3 Ge

It is well established that the anomalous Hall effect displayed by a ferromagnet scales with its magnetization. Therefore, an antiferromagnet that has no net magnetization should exhibit no anomalous Hall effect. We show that the noncolinear triangular antiferromagnet Mn3Ge exhibits a large anomalous Hall effect comparable to that of ferromagnetic metals; the magnitude of the anomalous conductivity is ~500 (ohm·cm)(-1) at 2 K and ~50 (ohm·cm)(-1) at room temperature. The angular dependence of the anomalous Hall effect measurements confirms that the small residual in-plane magnetic moment has no role in the observed effect except to control the chirality of the spin triangular structure. Our theoretical…

• DF
  Deutsche Forschungsgemeinschaft

  Awards: ID0ERUDI6613, Projects No.TP 1.2-Aand No. 2.3-A ofResearch UnitFOR 1464 ASPIMATT
• ER
  European Research Council

  Awards: ERC Advanced Grant No. (291472) "Idea Heusler", ID0ES1DI6614