Anomalous transverse response in Mn₃X (X=Sn, Ge)

In ferromagnets, there is an Anomalous Hall Effect (AHE) due to spontaneous magnetization. Recently, in a family of nonlinear antiferromagnets, Mn₃X (X=Sn, Ge), an unexpectedly large AHE has been detected and attributed to a nonvanishing Berry [1-3]. We present, a study of electric, thermoelectric and thermal transport in Mn₃X (X=Sn, Ge). The three anomalous transverse conductivities (Hall, Nernst, and Righi-Leduc) were quantified. The thermal and electrical Hall conductivities respect the Wiedemann-Franz law over the whole temperature range of study in Mn₃Sn [4]. We also carried out a study of angle-dependent AHE shedding additional light to the origin of anomalous transverse flow and their link to the locus of the Weyl nodes.
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3. N. Kiyohara, T. Tomita, and S. Nakatsuji, Phys. Rev. Appl. 5, 064009 (2016).
4. X. Li, L. Xu, L. Ding, J. Wang, M. Shen, X. Lu, Z. Zhu and K . Behnia, Phys. Rev. Lett.119, 056601 (2017)