{
  "abstract": "Dynamical control of altermagnetism is a key requirement for translating its unique spin-dependent functionalities into practical spintronic devices, yet effective switching mechanisms remain largely unexplored. Here, we open an unprecedented, versatile and programmable route based on spin-crossover to switch altermagnetism on demand in molecular materials. Using density functional calculations, we demonstrate an altermagnetic ground state in the layered van der Waals MOFs MnX$_2$(tdz)$_2$ (X = Cl, Br; tdz = thiadiazole), stabilized by anisotropic interlayer exchange interactions, which gives rise to a characteristic d-wave momentum-space spin splitting and an associated spin-splitter transport response. Our findings reveal that under hydrostatic pressure, a high-spin to low-spin transition reconfigures the Mn d-orbital occupation, thus modifying the magnetic exchange network, and stabilizing a different antiferromagnetic ground state whose symmetry suppresses the nonrelativistic spin splitting. Crucially, spin-crossover switches altermagnetism not by directly altering the electronic structure, but by changing the symmetry of the magnetic ground state. These results establish molecular spin-crossover altermagnets as a platform for externally reconfigurable spintronic devices.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.07548",
  "author_total": 4,
  "authors": [
    {
      "name": "Diego López-Alcalá"
    },
    {
      "name": "Alberto M. Ruiz"
    },
    {
      "name": "Andrei Shumilin"
    },
    {
      "name": "José J. Baldoví"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6w3axfq0755nv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.07548",
  "fulltext_url": null,
  "id": "6w3axfq0755nv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.07548",
  "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.mtrl-sci"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.07548",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6w3axfq0755nv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:48Z",
      "native_id": "2609.07548",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.07548"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Switchable Altermagnetism in a Layered van der Waals Metal-Organic Framework Driven by Spin-Crossover",
  "title_text": "Switchable Altermagnetism in a Layered van der Waals Metal-Organic Framework Driven by Spin-Crossover",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:48Z",
  "url": "https://research.draconitic.com/paper/6w3axfq0755nv",
  "venue": "arXiv",
  "versions": []
}