2020/01/17 by D. Destraz, L. Das, Lakshmi Kanta Das +17 · 1 citation
Materials Science · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Fermion #Ferromagnetism #Graphene research and applications #Hall effect #Magnetic field #Magnetism #Magnetization #Nernst effect #Nernst equation #Physics #Quantum mechanics #Semimetal #Spintronics #Topological Materials and Phenomena #Weyl semimetal #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1038/s41535-019-0207-7
published as npj Quantum Materials 5, 5 (2020) · 42 pages, 5 figures
openalex publication_date 2020/01/17 · openalex created_date 2020/01/23 · arxiv created 2020/08/04 · arxiv updated 2020/08/05 · openalex updated_date 2026/08/06
Abstract In 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.