X (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.
1. S. Nakatsuji, N. Kiyohara, and T. Higo, Nature 527, 212 (2015).
2. A. K. Nayak et al., Sci. Adv. 2: e1501870 (2016).
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)