{
  "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.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Physical Review B 114, 204418 (2026)",
  "arxiv": "2610.29708",
  "author_total": 14,
  "authors": [
    {
      "name": "Jin Ding"
    },
    {
      "name": "Yang Liu"
    },
    {
      "name": "Feihao Pan"
    },
    {
      "name": "Yinghao Zhu"
    },
    {
      "name": "Yixi Su"
    },
    {
      "name": "Stanislav E. Nikitin"
    },
    {
      "name": "Ursula B. Hansen"
    },
    {
      "name": "Mechthild Enderle"
    },
    {
      "name": "Zhilun Lu"
    },
    {
      "name": "Linxuan Song"
    },
    {
      "name": "Yong-Chang Lau"
    },
    {
      "name": "Xiaoyan Ma"
    },
    {
      "name": "Enke Liu"
    },
    {
      "name": "Huiqian Luo"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6bsh4m4y8fkvd.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.29708",
  "fulltext_url": null,
  "id": "6bsh4m4y8fkvd",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.29708",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.str-el"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.29708",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6bsh4m4y8fkvd.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:19Z",
      "native_id": "2610.29708",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.29708"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Spin order and excitations in the collinear kagome antiferromagnet Y$_{0.5}$Fe$_3$Sn$_3$",
  "title_text": "Spin order and excitations in the collinear kagome antiferromagnet Y_0.5Fe_3Sn_3",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:19Z",
  "url": "https://research.draconitic.com/paper/6bsh4m4y8fkvd",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/mjd4-ylmx",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}