{
  "abstract": "Positive anisotropy temperature coefficients ($dK/dT>0$) usually arise from hybridization between magnetic 3d states and strongly spin-orbit-coupled (SOC) subsystems. Yet $ε$-Fe$_2$O$_3$ shows $dK/dT>0$ (125-200~K) without an obvious SOC partner. We study pure and Cr-doped (with weakened Fe-O hybridization) $ε$-Fe$_2$O$_3$ across the transition from low temperature incommensurate to high-anisotropy magnetic phases. We identify a $d^6L$ groundstate in $ε$-Fe$_2$O$_3$ while reduced hybridization yields $d^6 + d^6L^2$ in the Cr-doped system, highlighting metal-ligand hybridization as a route to tune magnetic, electronic and orbitronic properties.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.08927",
  "author_total": 3,
  "authors": [
    {
      "name": "Rachel Nickel"
    },
    {
      "name": "Kurt Kummer"
    },
    {
      "name": "Johan van Lierop"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/89yzvnr1x4zd7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.08927",
  "fulltext_url": null,
  "id": "89yzvnr1x4zd7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.08927",
  "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.str-el"
    ],
    [
      "openalex",
      "3104|Advanced Condensed Matter Physics"
    ]
  ],
  "openalex": "W7212044946",
  "pdf_url": "https://arxiv.org/pdf/2609.08927",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/89yzvnr1x4zd7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:52Z",
      "native_id": "2609.08927",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.08927"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Positive Temperature Coefficient of Anisotropy due to $d^6L$ Groundstate in $ε$-Fe$_2$O$_3$",
  "title_text": "Positive Temperature Coefficient of Anisotropy due to d^6L Groundstate in ε-Fe_2O_3",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:52Z",
  "url": "https://research.draconitic.com/paper/89yzvnr1x4zd7",
  "venue": "arXiv",
  "versions": []
}