{
  "abstract": "We present a multiconfigurational, relativistic embedded-cluster study of the local electronic structure of ruthenium dioxide ($\\mathrm{RuO_2}$), a candidate altermagnetic material. Starting from free $\\mathrm{Ru}$ ions, we progressively build up the local environment through a $\\mathrm{Ru+Q_6}$ electrostatic model, a bare $\\mathrm{[RuO_6]^{8-}}$ ligand model, and finally a high-accuracy $\\mathrm{RuO_6}$@CTEP embedded cluster that reproduces the crystalline surroundings. All systems are treated at the SA-CASSCF and NEVPT2+SOC levels of theory to capture strong electron correlation and spin-orbit coupling on an equal footing. While the formal local site symmetry of the $\\mathrm{Ru}$ sites in $\\mathrm{RuO_2}$ is orthorhombic ($D_{2h}$), we find that the calculated $4d$-orbital energy spectrum and its splitting pattern behave much closer to the higher tetragonal ($D_{4h}$) symmetry, preserving a strong quasi-degeneracy among the relevant $4d$ orbitals. Since the local $xy$ quadrupolar order responsible for altermagnetic spin splitting in independent-particle models relies on this symmetry reduction, its suppression by orbital quasi-degeneracy offers a natural explanation for why altermagnetism is not observed in bulk $\\mathrm{RuO_2}$ experiments, in contrast to the robust altermagnetic signatures reported in strained thin films.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.20526",
  "author_total": 5,
  "authors": [
    {
      "name": "Zhosan I. A."
    },
    {
      "name": "Lomachuk Yu. V."
    },
    {
      "name": "Maltsev D. A."
    },
    {
      "name": "Moiseev I. A."
    },
    {
      "name": "Andreev O. Yu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6j5fwssb2qfc5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.20526",
  "fulltext_url": null,
  "id": "6j5fwssb2qfc5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.20526",
  "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"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "openalex",
      "3107|Advanced Chemical Physics Studies"
    ]
  ],
  "openalex": "W7213599620",
  "pdf_url": "https://arxiv.org/pdf/2609.20526",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6j5fwssb2qfc5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2609.20526",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.20526"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Multiconfigurational Analysis of Local Electronic Structure of $\\mathrm{RuO_2}$ Using Relativistic Embedded Clusters",
  "title_text": "Multiconfigurational Analysis of Local Electronic Structure of RuO_2 Using Relativistic Embedded Clusters",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/6j5fwssb2qfc5",
  "venue": "arXiv",
  "versions": []
}