{
  "abstract": "We investigate how doping-induced small polarons impact the low-temperature multipolar orders of the 5d² double perovskite Ba₂CaOsO₆. By computing intersite exchange interactions between 5d¹ localized hole polarons and 5d² magnetic ions from first principles, we demonstrate the reversal of the dominant octupolar exchange from ferromagnetic to antiferromagnetic. Solving the corresponding effective Hamiltonian, we find this reversal to account for the progressive suppression of the ferro-octupolar order and the reduction of the ordering temperature upon Na doping. These findings clarify previously ambiguous experimental observations and demonstrate that charge doping in the form of small polarons offers a viable route to tuning intersite exchange interactions in spin-orbit-entangled materials, enabling the emergence of novel quantum orders.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2603.18155",
  "author_total": 4,
  "authors": [
    {
      "name": "Dario Fiore Mosca"
    },
    {
      "name": "Lorenzo Celiberti"
    },
    {
      "name": "Leonid Pourovskii"
    },
    {
      "name": "Cesare Franchini"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bnyz5fq6hjv4t.bib",
  "cited_by": 0,
  "doi": "10.1103/r8v5-h8bq",
  "fulltext_url": null,
  "id": "bnyz5fq6hjv4t",
  "issns": [
    "0031-9007",
    "1079-7114"
  ],
  "landing_url": "https://hal.science/hal-05784524v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.cond"
    ],
    [
      "hal",
      "2.phys.cond.cm-ms"
    ],
    [
      "hal",
      "2.phys.cond.cm-sce"
    ],
    [
      "openalex",
      "2504|Magnetic and transport properties of perovskites and related materials"
    ]
  ],
  "openalex": "W7164801631",
  "pdf_url": "https://hal.science/hal-05784524/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": "American Physical Society",
  "ris": "https://research.draconitic.com/paper/bnyz5fq6hjv4t.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:50Z",
      "native_id": "hal-05784524",
      "source": "hal",
      "url": "https://hal.science/hal-05784524v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:1.phys.cond",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Polaron-Driven Switching of Octupolar Order in Doped 5d² Double Perovskite",
  "title_text": "Polaron-Driven Switching of Octupolar Order in Doped 5d² Double Perovskite",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:50Z",
  "url": "https://research.draconitic.com/paper/bnyz5fq6hjv4t",
  "venue": "Physical Review Letters",
  "versions": []
}