Magnetic Excitations in Non-Collinear Antiferromagnetic Weyl Semimetal $\mathsf{M}{\mathsf{n}}_3\mathsf{Sn}$

Abstract

$\mathsf{M}{\mathsf{n}}_3\mathsf{Sn}$ has recently attracted considerable attention as a magnetic Weyl semimetal exhibiting concomitant transport anomalies at room temperature. The topology of the electronic bands, their relation to the magnetic ground state and their nonzero Berry curvature lie at the heart of the problem. The examination of the full magnetic Hamiltonian reveals otherwise hidden aspects of these unusual physical properties. Here, we report the full spin wave spectra of $\mathsf{M}{\mathsf{n}}_3\mathsf{Sn}$ measured over a wide momentum - energy range by the inelastic neutron scattering technique. Using a linear spin wave theory, we determine a suitable magnetic Hamiltonian which not only explains the experimental results but also stabilizes the low-temperature helical phase, consistent with our DFT calculations. The effect of this helical ordering on topological band structures is further examined using a tight-binding method, which confirms the elimination of Weyl points in the helical phase. Our work provides a rare example of the intimate coupling between the electronic and spin degrees of freedom for a magnetic Weyl semimetal system.

22 pages, 5 figures, accepted for publication in npj Quantum Materials

References in corpus (23)

• Topological Insulators
• Mantid - Data Analysis and Visualization Package for Neutron Scattering and $\mu SR$ Experiments
• Anomalous Hall effect arising from noncollinear antiferromagnetism
• Large anomalous Nernst effect at room temperature in a chiral antiferromagnet
• Evidence for Magnetic Weyl Fermions in a Correlated Metal
• Linear spin wave theory for single-Q incommensurate magnetic structures
• Weyl semimetal with broken time reversal and inversion symmetries
• Spin Waves and Magnetic Exchange Interactions in CaFe2As2
• Non-collinear Antiferromagnets and the Anomalous Hall Effect
• Strong, anisotropic anomalous Hall effect and spin Hall effect in chiral antiferromagnetic compounds Mn${}_{3}X$ ($X$ = Ge, Sn, Ga, Ir, Rh and Pt)
• Spin-polarized current in non-collinear antiferromagnets
• Anomalous Nernst and Righi-Leduc effects in Mn${}_3$Sn: Berry curvature and entropy flow
• HORACE: software for the analysis of data from single crystal spectroscopy experiments at time-of-flight neutron instruments
• Theoretical prediction of magnetic and noncentrosymmetric Weyl fermion semimetal states in the R-Al-X family of compounds (R=rare earth, Al=aluminium, X=Si, Ge)
• Anomalous Hall effect and topological defects in antiferromagnetic Weyl semimetals: Mn${}_3$Sn/Ge
• Itinerant magnetic excitations in antiferromagnetic CaFe2As2
• Giant magnetic anisotropy of the bulk antiferromagnets IrMn and IrMn3
• Magnetic Phase Dependence of the Anomalous Hall Effect in Mn${}_3$Sn Single Crystals
• Large anomalous Nernst and spin Nernst effects in noncollinear antiferromagnets Mn${}_{3}X$ ($X$ = Sn, Ge, Ga)
• Atomistic spin-model based on a new spin-cluster expansion technique: Application to the IrMn3/Co interface
• Temperature-Dependent Interplay of Dzyaloshinskii-Moriya Interaction and Single-Ion Anisotropy in Multiferroic BiFeO${}_3$
• Anomalous Hall Effect and Spontaneous Orbital Magnetization in Antiferromagnetic Weyl Metal
• Evolution of the multiband RKKY interaction: Application to iron pnictides and chalcogenides

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• Anisotropic magnetic interactions in hexagonal AB-stacked kagome lattice structures: Applications to ${\mathrm{Mn}}_3\mathrm{X}$ ($\mathrm{X}$ = $\mathrm{Ge}$, $\mathrm{Sn}$, $\mathrm{Ga}$) compounds
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• Imprinting electrically switchable scalar spin chirality by anisotropic strain in a Kagome antiferromagnet
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• Incommensurate magnetic ordering in CrB${}_2$