{
  "abstract": "The microscopic origin of magnetism in CeFe$_2$ has remained unresolved for almost forty years, where polarized-neutron diffraction and x-ray magnetic circular dichroism infer markedly different Ce $4f$ spin and orbital moments, that also are in disagreement with theory. We show here that within a relativistic multi-impurity DFT+DMFT framework, where the Fe $3d$ states are treated by spin-polarized T-matrix fluctuation exchange and Ce $4f$ orbitals by a bath-coupled configuration-interaction solver, this long standing problem is resolved. This level of theory is exclusive in reproducing magnetic moments (spin and orbital) for both the Ce and Fe atoms, yielding a total moment in agreement with the measured saturation moment. The theory put forth here is much closer to the atom specific moments reported from XMCD, compared to values from polarized-neutron diffraction. The occupation $\\langle n_f\\rangle=0.85$ and charge variance $δn_f^2=0.27$ establish substantial valence fluctuations, while the spectral function simultaneously recovers significant weight at the Fermi level together with separate incoherent structures. These results identify bath-mediated polarization and configuration mixing as the essential ingredients governing the electronic structure and magnetism of CeFe$_2$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.29241",
  "author_total": 3,
  "authors": [
    {
      "name": "Basile Herzog"
    },
    {
      "name": "Vladislav Borisov"
    },
    {
      "name": "Olle Eriksson"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a6a1g931h96he.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.29241",
  "fulltext_url": null,
  "id": "a6a1g931h96he",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.29241",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "openalex",
      "3104|Rare-earth and actinide compounds"
    ]
  ],
  "openalex": "W7214354808",
  "pdf_url": "https://arxiv.org/pdf/2609.29241",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-24",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a6a1g931h96he.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:11Z",
      "native_id": "2609.29241",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.29241"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Mixed-Valent Magnetism in CeFe$_2$ from Multi-Impurity DFT+DMFT",
  "title_text": "Mixed-Valent Magnetism in CeFe_2 from Multi-Impurity DFT+DMFT",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:11Z",
  "url": "https://research.draconitic.com/paper/a6a1g931h96he",
  "venue": "arXiv",
  "versions": []
}