Regensburg 2022 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 30: Skyrmions 3 (joint session MA/KFM)
KFM 30.4: Talk
Friday, September 9, 2022, 10:15–10:30, H37
Fermi-surface origin of helical single Q-state and skyrmion lattice in centrosymmetric Gd compounds — •Juba Bouaziz1, Eduardo Mendive-Tapia1, Stefan Blügel1, and Julie Staunton2 — 1Forschungszentrum Jülich, Germany — 2University of Warwick, Coventry CV4 7AL, United Kingdom
We show from first principles that cylindrical structures within the Fermi surface are the origin of the single-Q helical state in the GdRu2Si2 and Gd2PdSi3 intermetallic compounds. The geometry of the Fermi surface nesting describes the strength and sign of the underlying pairwise Ruderman-Kittel-Kasuya-Yosida interactions between the Gd moments as the main mechanism. These interactions are quasi-two-dimensional, isotropic within the Gd layers, and provide a transition temperature and helix period in very good agreement with experiment. Using atomistic spin-dynamical simulations, we investigate the effects of magnetic anisotropy and construct a general magnetic phase diagram that explains the stabilization of the 2Q-skyrmion lattice observed in experiment with applied magnetic fields.
Funding: ERC Grant No. 856538 (project “3D MAGiC”), SPP 2137 “Skyrmionics” (Project No. BL 444/16), UK EPSRC Grant No. EP/M028941/1.