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TT: Fachverband Tiefe Temperaturen

TT 23: Topological Insulators and Weyl Semimetals (joint session MA/TT)

TT 23.12: Talk

Tuesday, March 19, 2024, 12:30–12:45, H 2013

Origin of incommensurate magnetic order in rare-earth magnetic Weyl semimetals — •Juba Bouaziz¹, Gustav Bihlmayer¹, Christopher E. Patrick², Julie B. Staunton³, and Stefan Blügel¹ — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich JARA, D-52425 Jülich, Germany — ²Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom — ³Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom

We investigate rare-earth magnetic Weyl semimetals through first-principles simulations, analyzing the connection between incommensurate magnetic order and the presence of Weyl nodes in the electronic band structure. Focusing on PrAlSi, NdAlSi, and SmAlSi, we demonstrate that the reported helical ordering does not originate from the nesting of topological features at the Fermi Surface or the Dzyaloshinskii-Moriya interaction. Instead, the helical order arises from frustrated isotropic short-range superexchange between the 4f moments facilitated by pd-hybridization with the main group elements. Employing a spin Hamiltonian with isotropic exchange and single-ion anisotropy we replicate the experimentally observed helical modulation. Funding: European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Grant No. 856538, project ``3D MAGiC'')

Keywords: incommensurate magnetic order; Magnetic interactions; Crystal field effects