Topological features in the ferromagnetic Weyl semimetal CeAlSi: Role of domain walls

Abstract

In the ferromagnetic (FM) Weyl semimetal CeAlSi both space-inversion and time-reversal symmetries are broken. Our quantum oscillation (QO) data indicate that the FM ordering modifies the Fermi surface topology and also leads to an unusual drop in the QO amplitude. In the FM phase, we find a pressure-induced suppression of the anomalous and the loop Hall effects. This cannot be explained based on the electronic band structure or magnetic structure, both of which are nearly pressure independent. Instead, we show that a simplified model describing the scattering of Weyl fermions off FM domain walls can potentially explain the observed topological features. Our study highlights the importance of domain walls for understanding transport in FM Weyl semimetals.

This article supersedes arXiv:2111.05742 including additional theoretical results. Published in Physical Review Research

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Cited by in corpus (3)

• Anomalous Hall effect with plateaus observed in a magnetic Weyl semimetal NdAlGe at low temperatures
• Topological Hall effect enhanced at magnetic transition fields in a frustrated magnet EuCd${}_2$
• Spin order and dynamics in the topological rare-earth germanide semimetals