{
  "abstract": "Lightly Cu-doped BiMn$_7$O$_{12}$ (x = 0.05, 0.10, and 0.15) was investigated using high-pressure synthesis, single-crystal X-ray diffraction, pair distribution function (PDF) analysis, STEM, magnetic measurements, and first-principles calculations. All compositions retain an average monoclinic $I$2/$m$ structure, while Cu substitution progressively suppresses the monoclinic distortion and drives the lattice toward a pseudo-cubic metric symmetry. PDF analysis reveals increasing local structural disorder and reduced medium-range coherence with increasing Cu concentration, despite preservation of the overall quadruple-perovskite framework. Single-crystal refinements indicate enhanced electron density at the octahedral Mn B sites, suggesting preferential Cu occupation within the MnO$_6$ network rather than the conventional square-planar sites expected for Cu$^{2+}$. Magnetic measurements reveal two characteristic anomalies near $T_1$ ~ 100-120 K and $T_2$ ~ 50-60 K, together with pronounced magnetic irreversibility, field-dependent hysteresis, and unsaturated magnetization. Increasing Cu concentration progressively suppresses the low-temperature magnetic state and weakens the field-induced moment. First-principles calculations favor Cu occupation at the square-planar sites, contrasting with the experimental refinements and highlighting strong competitions among local bonding, short-range disorder, and metastability in this highly frustrated quadruple perovskite system.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.12711",
  "author_total": 6,
  "authors": [
    {
      "name": "Cheng Peng"
    },
    {
      "name": "Mingyu Xu"
    },
    {
      "name": "Yang Zhang"
    },
    {
      "name": "Ismail El Baggari"
    },
    {
      "name": "Jie Li"
    },
    {
      "name": "Weiwei Xie"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7v8fp9w2htp2v.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.12711",
  "fulltext_url": null,
  "id": "7v8fp9w2htp2v",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.12711",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2606.12711",
  "pmcid": null,
  "pmid": null,
  "published": "2026-06-10",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7v8fp9w2htp2v.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2606.12711",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.12711"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Site Preferences and \"Coloring Problem\" in Cu-doped BiMn$_7$O$_{12}$ Quadruple Perovskite",
  "title_text": "Site Preferences and \"Coloring Problem\" in Cu-doped BiMn_7O_12 Quadruple Perovskite",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/7v8fp9w2htp2v",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1002/apxr.70201",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}