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Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Destraz Daniel, Das Lakshmi, Tsirkin Stepan S., Xu Yang, Neupert Titus, Chang J., Schilling A., Grushin Adolfo G., Kohlbrecher Joachim, Keller Lukas, Puphal Pascal, Pomjakushina Ekaterina, White Jonathan S.,
Project Discovery and Nanoengineering of Novel Skyrmion-hosting Materials
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Original article (peer-reviewed)

Journal npj Quantum Materials
Volume (Issue) 5(1)
Page(s) 5 - 5
Title of proceedings npj Quantum Materials
DOI 10.1038/s41535-019-0207-7

Open Access

URL http://doi.org/10.1038/s41535-019-0207-7
Type of Open Access Publisher (Gold Open Access)

Abstract

AbstractIn 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.
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