In magnetic Weyl semimetals, where magnetism breaks time-reversal symmetry, large magnetically sensitive anomalous transport responses are anticipated that could be useful for topological spintronics. The identification of new magnetic Weyl semimetals is therefore in high demand, particularly since in these systems Weyl node configurations may be easily modified using magnetic fields. Here we explore experimentally the magnetic semimetal PrAlGe, and unveil a direct correspondence between easy-axis Pr ferromagnetism and anomalous Hall and Nernst effects. With sizes of both the anomalous Hall conductivity and Nernst effect in good quantitative agreement with first principles calculations, we identify PrAlGe as a system where magnetic fields can connect directly to Weyl nodes via the Pr magnetisation. Furthermore, we find the predominantly easy-axis ferromagnetic ground state co-exists with a low density of nanoscale textured magnetic domain walls. We describe how such nanoscale magnetic textures could serve as a local platform for tunable axial gauge fields of Weyl fermions.

在磁性Weyl半金属中，磁性打破了时间反转对称性，因此预计会有大的磁敏感异常传输响应，这对于拓扑自旋电子学可能是有用的。因此，对新的磁性Weyl半金属的鉴定有很高的要求，特别是因为在这些系统中，Weyl节点的配置可以很容易地利用磁场进行修改。在这里，我们通过实验探索磁性半金属PrAlGe，并揭示了易轴Pr铁磁性与反常霍尔和能斯特效应之间的直接对应关系。由于霍尔电导率和能斯特反常效应的大小与第一性原理计算具有良好的定量一致性，因此我们将PrAlGe识别为磁场可以通过Pr磁化直接连接到Weyl节点的系统。此外，我们发现主要是易轴铁磁基态与低密度的纳米尺度磁畴壁共存。我们描述了这种纳米尺度的磁织构如何作为Weyl费米子轴向可调场的局部平台。