Pressure tuning domain-wall chirality in noncentrosymmetric magnetic Weyl semimetal CeAlGe

Abstract

Topological magnetic Weyl semimetals have been proposed to host controllable chiral domain walls which bear a great prospect in device applications. To exploit them in applications, it is important to have a proper way to tune and manipulate these domain walls. One possible means is through magnetoelastic coupling. The involvement of rare earth in the lately proposed $R$Al$X$ ($R$=rare earth, $X$=Si and Ge) family magnetic Weyl semimetals may provide such a platform. Here we present transport and thermodynamic properties of CeAlGe under hydrostatic pressure. We find that pressure enhances the antiferromagnetic exchange in CeAlGe but essentially retains its magnetic structure. Large topological Hall effect with pronounced loop shape is observed within the magnetically ordered state, and it splits into two regions under pressure. Such an unusual electromagnetic response is inferred to be a consequence of chiral magnetic domain walls. The unprecedented concomitance of its evolution under pressure and the reentrance of antiferromagnetic order strongly suggest the capability of switching on/off this electromagnetic response in noncentrosymmetric magnetic Weyl semimetals via magnetoelastic coupling.

20+3 pages, 5+3 figures, 1 table

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Cited by in corpus (14)

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• Topological Hall effect in CeAlGe
• Magnetic, thermodynamic, and magnetotransport properties of CeGaGe and PrGaGe single crystals
• Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe
• Anomalous Hall effect with plateaus observed in a magnetic Weyl semimetal NdAlGe at low temperatures
• Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd2As2
• Rich unconventional Hall effects in a single quasi-kagome Kondo Weyl semimetal candidate Ce${}_3$TiSb${}_5$
• Structural characterization of the candidate Weyl semimetal CeGaGe
• Spin order and dynamics in the topological rare-earth germanide semimetals
• Topological Hall effect enhanced at magnetic transition fields in a frustrated magnet EuCd${}_2$
• ${}^{27}$Al NMR study of the magnetic Weyl semimetal CeAlGe
• Field-induced magnetic phase transitions and transport anomalies in GdAlSi
• Crystalline electric field excitations in Weyl semimetal \textit{R}AlSi (\textit{R} = Ce, Pr and Nd)
• Light-induced pseudo-magnetic fields in three-dimensional topological semimetals