{
  "abstract": "The Fe-based superconductors are derived from metallic parent compounds with nematic and stripe magnetic orders, which lead to two types of magnetic domains. Recently it was found that K$_5$Fe$_4$Ag$_6$Te$_{10}$ (KFAT), an Fe-based semiconductor, exhibits similar nematic and stripe magnetic orders, and is thus an analogue to the Fe-based superconductors in the limit of localized electrons. In this work, the superstructure and magnetic domains of KFAT are elucidated by fully mapping the reciprocal space using time-of-flight single crystal neutron diffraction. In KFAT, Fe and Ag atoms order to form a $\\sqrt{5}\\times\\sqrt{5}$ superstructure containing $2\\times2$ Fe blocks, which leads to two superstructure domains with identical main Bragg peaks but distinct superstructure peaks. Below $T_{\\rm N}\\approx35$~K, magnetic and nematic orders break in-plane rotational symmetry of the tetragonal $\\sqrt{5}\\times\\sqrt{5}$ superstructure, and further give rise to two magnetic domains. These four equally populated domains account for the complex scattering pattern observed in our time-of-flight elastic neutron scattering measurements. Using polarized neutron scattering, we demonstrate a prominent spin anisotropy with an easy-plane spanned by the $c$-axis and the intra-block antiferromagnetic Fe-Fe bond direction. Such an anisotropy at ${\\bf q}\\neq0$ persists well above $T_{\\rm N}$, accounts for the in-plane ${\\bf q}=0$ magnetic anisotropy observed in uniaxial-strained KFAT, and offers an indicator for discovering similar piezomagnetic effects in other materials.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Physical Review B 114, 175116 (2026)",
  "arxiv": "2609.15290",
  "author_total": 15,
  "authors": [
    {
      "name": "Jiayu Guo"
    },
    {
      "name": "Hengyang Zhong"
    },
    {
      "name": "Dongsheng Yuan"
    },
    {
      "name": "Xuejuan Gui"
    },
    {
      "name": "Youzhe Chen"
    },
    {
      "name": "Nathan Giles-Donovan"
    },
    {
      "name": "Naomi Kawamura"
    },
    {
      "name": "Masaaki Matsuda"
    },
    {
      "name": "Yaohua Liu"
    },
    {
      "name": "Feng Ye"
    },
    {
      "name": "Rongyan Chen"
    },
    {
      "name": "Robert J. Birgeneau"
    },
    {
      "name": "Xingye Lu"
    },
    {
      "name": "Jincheng Wang"
    },
    {
      "name": "Yu Song"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/09x3052p6v4af.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.15290",
  "fulltext_url": null,
  "id": "09x3052p6v4af",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.15290",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.15290",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/09x3052p6v4af.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.15290",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.15290"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Twinning of domains and spin anisotropy in K$_5$Fe$_4$Ag$_6$Te$_{10}$",
  "title_text": "Twinning of domains and spin anisotropy in K_5Fe_4Ag_6Te_10",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/09x3052p6v4af",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/y7tn-ptpw",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}