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PreprintCC BY 4.0arXiv

Spin order and excitations in the collinear kagome antiferromagnet Y0.5Fe3Sn3

  • Jin Ding
  • Yang Liu
  • Feihao Pan
  • Yinghao Zhu
  • Yixi Su
  • Stanislav E. Nikitin
  • Ursula B. Hansen
  • Mechthild Enderle
  • Zhilun Lu
  • Linxuan Song
  • Yong-Chang Lau
  • Xiaoyan Ma
2 more authors
  • Enke Liu
  • Huiqian Luo
Open at sourcePDFDOICite

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 Y0.5Fe3Sn3, which orders into a collinear c-axis antiferromagnetic (AF) state below TN = 551 K. An additional anomalous Hall effect (AHE) contribution beyond the conventional magnetization-scaling response is observed well below TN under an in-plane magnetic field B ∥ 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 Mab dominates while the c-axis component Mc is nearly absent. Upon warming, Mc gradually grows markedly but remains much weaker than Mab 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 Y0.5Fe3Sn3 as a platform for chirality-driven AHE without spontaneous spin reorientation.

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Cite

BibTeXRIS
BibTeX
@misc{ding2026spin,
  title = {{Spin order and excitations in the collinear kagome antiferromagnet Y$_0.5$Fe$_3$Sn$_3$}},
  author = {Jin Ding and Yang Liu and Feihao Pan and Yinghao Zhu and Yixi Su and Stanislav E. Nikitin and Ursula B. Hansen and Mechthild Enderle and Zhilun Lu and Linxuan Song and Yong-Chang Lau and Xiaoyan Ma and Enke Liu and Huiqian Luo},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.29708},
  eprint = {2610.29708},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.29708},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Spin order and excitations in the collinear kagome antiferromagnet Y_0.5Fe_3Sn_3
AU  - Jin Ding
AU  - Yang Liu
AU  - Feihao Pan
AU  - Yinghao Zhu
AU  - Yixi Su
AU  - Stanislav E. Nikitin
AU  - Ursula B. Hansen
AU  - Mechthild Enderle
AU  - Zhilun Lu
AU  - Linxuan Song
AU  - Yong-Chang Lau
AU  - Xiaoyan Ma
AU  - Enke Liu
AU  - Huiqian Luo
PY  - 2026
DA  - 2026/10/21
PB  - arXiv
DO  - 10.48550/arxiv.2610.29708
UR  - https://arxiv.org/abs/2610.29708
AB  - 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_0.5Fe_3Sn_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 B ∥ 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_0.5Fe_3Sn_3 as a platform for chirality-driven AHE without spontaneous spin reorientation.
ER  -