Spin order and excitations in the collinear kagome antiferromagnet Y${}_{0.5}$Fe${}_3$Sn${}_3$

Abstract

Kagome lattices host rich magnetic, topological, and transport phenomena owing to their geometric frustration and strong spin correlations. Here we present a systematic neutron scattering study of the kagome metal Y${}_{0.5}$Fe${}_3$Sn${}_3$, which orders into a collinear $c$-axis antiferromagnetic (AF) state below $T_N=$ 551 K. An additional anomalous Hall effect (AHE) contribution beyond the conventional magnetization-scaling response is observed well below $T_N$ under an in-plane magnetic field $\mathbf{B}\parallel ab$. Elastic neutron scattering demonstrates that the Fe moments preserve their collinear $c$-axis AF alignment down to 1.5 K at zero field. Inelastic neutron scattering reveals a distinctive Y-shape spin excitation dispersion exhibiting a two-gap structure below 10 meV, likely arising from two nondegenerate spin-wave branches. Polarized neutron measurements further show that the low-temperature spin excitations are strongly anisotropic: the in-plane component $M_{ab}$ dominates while the $c$-axis component $M_c$ is nearly absent. Upon warming, $M_c$ gradually grows markedly but remains much weaker than $M_{ab}$ even at 300 K. We propose that the unconventional AHE originates from a nonzero scalar spin chirality induced by field-driven spin canting either in the static or dynamic configurations due to gapless excitations. These findings establish the collinear AF kagome metal Y${}_{0.5}$Fe${}_3$Sn${}_3$ as a platform for chirality-driven AHE without spontaneous spin reorientation.

arXiv comment21 pages, 15 figures, Published on Physical Review B

References in corpus (64)

• Anomalous Hall effect
• Topological Hall effect in the A-phase of MnSi
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• Massive Dirac fermions in a ferromagnetic kagome metal
• Large anomalous Hall effect driven by non-vanishing Berry curvature in non-collinear antiferromagnetic Mn3Ge
• Anomalous Hall effect arising from noncollinear antiferromagnetism
• Skyrmion lattice with a giant topological Hall effect in a frustrated triangular-lattice magnet
• Observation of the Magnon Hall Effect
• Evidence for Magnetic Weyl Fermions in a Correlated Metal
• Topological Hall effect and Berry phase in magnetic nanostructures
• Topological kagome magnets and superconductors
• Quantum anomalous Hall effect and related topological electronic states
• Progress and prospects in magnetic topological materials
• Giant Anomalous Hall Effect in the Chiral Antiferromagnet Mn3Ge
• Kagome superconductors AV${}_3$Sb${}_5$ (A=K, Rb, Cs)
• Novel magnetic states and nematic spin chirality in the kagome lattice metal YMn${}_6$Sn${}_6$
• Quantum states and intertwining phases in kagome materials
• Rare earth engineering in RMn${}_6$Sn${}_6$ topological kagome magnets
• Near-room-temperature giant topological Hall effect in antiferromagnetic kagome metal YMn6Sn6
• In-plane magnetic field induced double fan spin structure with $\text{c}$-axis component in metallic kagome antiferromagnet YMn${}_6$Sn${}_6$
• Spin chirality fluctuation in two-dimensional ferromagnets with perpendicular anisotropy
• Superconductivity emerging from density-wave-like order in a correlated kagome metal
• Magnetic Phase Dependence of the Anomalous Hall Effect in Mn${}_3$Sn Single Crystals
• Coexistence and competition of the short-range incommensurate antiferromagnetic order with superconductivity in BaFe2-xNixAs2
• Topological Quantum Materials with Kagome Lattice
• Scattering universality classes of side jump in anomalous Hall effect
• Magnetic Excitations in Non-Collinear Antiferromagnetic Weyl Semimetal $\mathsf{M}{\mathsf{n}}_3\mathsf{Sn}$
• Avoided quantum criticality and magnetoelastic coupling in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Anomalous Hall effect in ferrimagnetic metal RMn6Sn6 (R = Tb, Dy, Ho) with clean Mn kagome lattice
• Controllable chirality-induced geometrical Hall effect in a frustrated highly-correlated metal
• Field-linear anomalous Hall effect and Berry curvature induced by spin chirality in the kagome antiferromagnet Mn3Sn
• Anisotropically large anomalous and topological Hall effect in a kagome magnet
• Topological magnon bands in a room temperature Kagome magnet
• Spin excitation anisotropy as a probe of orbital ordering in the paramagnetic tetragonal phase of superconducting BaFe1.904Ni0.096As2
• Chiral properties of the zero-field spiral state and field-induced magnetic phases of the itinerant kagome metal YMn${}_6$Sn${}_6$
• General theory of topological Hall effect in systems with chiral spin textures
• Anisotropic Neutron Spin Resonance in Superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• Local magnetic anisotropy in BaFe${}_2$As${}_2$: a polarized inelastic neutron scattering study
• Theory of giant skew scattering by spin cluster
• Interplay between magnetism and band topology in Kagome magnets $R$Mn${}_6$Sn${}_6$
• Spin Excitations and Spin Wave Gap in the Ferromagnetic Weyl Semimetal Co${}_3$Sn${}_2$S${}_2$
• Non-linear Hall Effects: Mechanisms and Materials
• Switching of a large anomalous Hall effect between metamagnetic phases of a non-collinear antiferromagnet
• Spectral evidence for Dirac spinons in a kagome lattice antiferromagnet
• Study of the topological Hall effect on simple models
• Thermally Driven Topology in Chiral Magnets
• Origin of spin reorientation and intrinsic anomalous Hall effect in the kagome ferrimagnet TbMn6Sn6
• Altermagnetic Ground State in Distorted Kagome Metal CsCr${}_3$Sb${}_5$
• Direct observation of Fe spin reorientation in single crystalline YbFe6Ge6
• Kagome lattice promotes chiral spin fluctuations
• Magnetic-field modulation of topological electronic states and emergent magneto-transport in a magnetic Weyl semimetal
• Topological Hall effect induced by chiral fluctuations in ErMn6Sn6
• New insight into tuning magnetic phases of $R$Mn${}_6$Sn${}_6$ kagome metals
• Orbital character of the spin-reorientation transition in TbMn${}_6$Sn${}_6$
• Colossal enhancement of spin-chirality-related Hall effect by thermal fluctuation
• Chiral and flat-band magnetic cluster excitations in a ferromagnetic kagome metal
• Preferred Spin Excitations in the Bilayer Iron-Based Superconductor CaK(Fe${}_{0.96}$Ni${}_{0.04}$)${}_4$As${}_4$ with Spin-Vortex Crystal Order
• Electronic band structures of topological kagome materials
• Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe
• Anomalous-Hall Neel textures in altermagnetic materials
• Doping effects of Cr on the physical properties of BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Anomalous Electrical Transport in the Kagome Magnet YbFe${}_6$Ge${}_6$
• Temperature and polarization dependence of low-energy magnetic fluctuations in nearly-optimal-doped NaFe${}_{0.9785}$Co${}_{0.0215}$As
• Anomalous Nernst Effect and Its Implications for Time-Reversal Symmetry Breaking in Kagome Metal ScV6Sn6