Tuning the topological Hall effect of CeAlGe by external pressure*

 A topological Hall effect (THE) may arise from non-trivial topological spin textures, such as chiral domain walls, which have potential applications in spintronics [1]. The interplay of Weyl fermions and domain walls yields a topological Hall torque, which can efficiently manipulate the magnetization [2].

  At ambient pressure, CeAlGe is a Weyl semimetal hosting a topological magnetic phase [3], making it an excellent candidate to study non-trivial topologies in real and momentum space. Our results reveal that, similar to its magnetism [4], the THE in CeAlGe is sensitive to slight stoichiometric variations. The application of external pressure modifies the domain walls landscape leading to a pressure-induced evolution of a single THE region to two distinct regions in magnetic fields, in agreement with other results [5]. In addition, a THE was induced by pressure even in samples, where it was absent at low pressures. Our findings showing the high tunability of CeAlGe are a promising result on the way to induce THE in devices with external stimuli in a controlled way.

 

[1] S.-H. Yang, et al., Nat. Rev. Phys. 3, 328 (2021).

[2] M. Yamanouchi et al., Science advances 8 15 eabl6192 (2022).

[3] P. Puphal, et al., Phys. Rev. Lett. 124 017202 (2020).

[4] P. Puphal, et al., Phys. Rev. Mat. 3 024204 (2019).

[5] X. He, et al., arXiv:2207.08442