Anomalous transverse response in nodal line semimetal Mn 3 SnC

The interplay of topological surface states and magnetism gives rise to the unconventional transport behaviors such as anomalous Hall effect (AHE) and anomalous Nernst effect (ANE). The antiperovskites like Mn₃SnC, which are nodal-line semimetal and exhibits concurrent antiferromagnetic (AFM)-ferromagnetic (FM) ordering offer a fertile ground for anomalous transport. Here we report that the anomalous transport (AHE and ANE) in the compound is mainly dominated by the intrinsic Berry curvature effect. We establish a unified relationship between the AHE and ANE using Mott's relation. The scattering of electrons with both antiferromagnetic and ferromagnetic magnons is manifested in the anomalous Nernst signal. The ratio of anomalous Nernst conductivity to anomalous Hall conductivity (|αxyA/σxyA|) is a sizable fraction of kB/e, which points toward the stronger contribution of the Berry curvature to the ANE.