{
  "abstract": "Altermagnetism, a moment-compensated magnetism with momentum-dependent spin splitting, has so far been realized primarily in Néel-type antiferromagnets. Here, we demonstrate altermagnetism in folded iron-chain systems with block-type magnetic order (e.g., $\\uparrow \\uparrow \\downarrow \\downarrow$). In the strictly one-dimensional (1D) case, altermagnetism is forbidden by the $[C_2||{\\cal T}]$ symmetry, but it can emerge when such chains are stacked into a quasi-1D array. To generate altermagnetic spin splitting via this chain-stacking mechanism, two essential ingredients are required: a block-type spin order that spontaneously breaks the combined parity-time reversal symmetry, and finite inter-chain hopping. Using first-principles calculations, we identify the K$_3$Fe$_2$Se$_4$ family as a promising platform that realizes this mechanism, hosting a $d$-wave altermagnet even without lattice $C_{4}$ symmetry. Moreover, owing to its lower symmetry, the block-type folded chain exhibits an isotropic altermagnetic spin splitting, which may manifest as an altermagnetic wrapping effect. Our findings unify real-space block magnetism and reciprocal-space altermagnetism, establishing folded iron chains as a tunable platform for zero-moment spintronic applications.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Phys. Rev. Lett. 137, 176702 (2026)",
  "arxiv": "2610.31732",
  "author_total": 6,
  "authors": [
    {
      "name": "Ling-Fang Lin"
    },
    {
      "name": "Yang Zhang"
    },
    {
      "name": "Satoshi Okamoto"
    },
    {
      "name": "Adriana Moreo"
    },
    {
      "name": "Lun-Hui Hu"
    },
    {
      "name": "Elbio Dagotto"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4y8h9jn9624hh.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.31732",
  "fulltext_url": null,
  "id": "4y8h9jn9624hh",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.31732",
  "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/2610.31732",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4y8h9jn9624hh.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:15Z",
      "native_id": "2610.31732",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.31732"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Altermagnetism in Folded Iron Chain Systems",
  "title_text": "Altermagnetism in Folded Iron Chain Systems",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:15Z",
  "url": "https://research.draconitic.com/paper/4y8h9jn9624hh",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/6327-7256",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}