Topological Hall effect in CeAlGe

Abstract

The Weyl semimetal CeAlGe is a promising material to study nontrivial topologies in real and momentum space due to the presence of a topological magnetic phase. Our results at ambient pressure show that the electronic properties of CeAlGe are extremely sensitive to small stoichiometric variations. In particular, the topological Hall effect (THE) present in CeAlGe is absent in some samples of almost identical chemical composition. The application of external pressure favors the antiferromagnetic ground state. It also induces a THE where it was not visible at ambient pressure. Furthermore, a small pressure is sufficient to drive the single region of the THE in magnetic fields into two different ones. Our results reveal an extreme sensitivity of the electronic properties of CeAlGe to tiny changes in its chemical composition, leading to a high tunability by external stimuli. We can relate this sensitivity to a shift in the Fermi level and to domain walls.

arXiv commentAccepted in Physical Review Materials

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• Experimental progress in Eu(Al,Ga)${}_4$ topological antiferromagnets
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• Spin order and dynamics in the topological rare-earth germanide semimetals
• On the magnetic contribution of itinerant electrons to neutron diffraction in the topological antiferromagnet CeAlGe
• ${}^{27}$Al NMR study of the magnetic Weyl semimetal CeAlGe
• Isotropic Dirac fermion and anomalous oscillator strength of zeroth Landau level transition
• Incommensurate magnetic order drives singular angular magnetoresistance in a Weyl semimetal
• Accessing quasi-flat $\text{f}$-bands to harvest large Berry curvature in NdGaSi
• Evolution of magnetic bubble domains in the uniaxial ferromagnet CeRu${}_2$Ga${}_2$B inferred from the Hall effect and ac magnetic susceptibility