{
  "abstract": "We report a neutron diffraction study of the structural and magnetic properties of a family of ferro- and ferrimagnetic Prussian blue analogues (PBAs), $A_4$[Fe(CN)$_6$]$_{2.7}$ ($A$ = Co, Mn, Ni), Rb$_2$Ni$_4$[Fe(CN)$_6$]$_{3.3}$, and Mn$_4$[Cr(CN)$_6$]$_{2.7}$, as a function of temperature (2--450~K) and applied magnetic field. All bimetallic compounds of the Fm$\\overline{3}$m family exhibit a broad diffuse feature at low scattering angle, which we identify, through comparison with the cation-stabilized Rb$_2$NiFe framework, as an intrinsic signature of correlated vacancies and their associated interstitial water. High-temperature diffraction reveals a continuous crossover from positive to negative thermal expansion in CoFe and MnFe upon dehydration, while NiFe remains structurally robust up to 450~K. At low temperature, all compounds order in a collinear ferrimagnetic state with propagation vector $\\mathbf{k}=(0,0,0)$, except MnFe, which adopts a partially frustrated magnetic structure with $\\mathbf{k}=(1,0,0)$. A moderate magnetic field of $B_c = 1.3$~T drives a spin reorientation in MnFe toward the collinear $\\mathbf{k}=(0,0,0)$ ferrimagnetic state common to the other compounds; the same transition is independently induced by dehydration. A minimal Heisenberg model shows that this transition results from a near-compensation between antiferromagnetic Mn--Fe coupling and a geometrically frustrated antiferromagnetic Mn--Mn interaction on the face-centered-cubic Mn sublattice, placing MnFe in the vicinity of a magnetic compensation point. These results resolve a longstanding ambiguity in the interpretation of the Fe $K$-edge XMCD response of MnFe-based PBAs, and establish water content as a key parameter controlling both the structural and magnetic stability of this family of materials, with direct relevance to their use as battery electrodes.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.08976",
  "author_total": 8,
  "authors": [
    {
      "name": "N. S. Dhami"
    },
    {
      "name": "C. V. Colin"
    },
    {
      "name": "V. Nassif"
    },
    {
      "name": "O. Fabelo"
    },
    {
      "name": "T. Nait"
    },
    {
      "name": "A. Bleuzen"
    },
    {
      "name": "A. Bordage"
    },
    {
      "name": "V. Balédent"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a7gwz6w5hz3xj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.08976",
  "fulltext_url": null,
  "id": "a7gwz6w5hz3xj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.08976",
  "language": "en",
  "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"
    ],
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      "arxiv",
      "cond-mat.other"
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      "0.phys"
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    [
      "openalex",
      "3104|Advanced Condensed Matter Physics"
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  "openalex": "W7212072140",
  "pdf_url": "https://arxiv.org/pdf/2609.08976",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a7gwz6w5hz3xj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:52Z",
      "native_id": "2609.08976",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.08976"
    },
    {
      "first_seen": "2026-11-06T12:20:44Z",
      "native_id": "hal-05854993",
      "source": "hal",
      "url": "https://hal.science/hal-05854993v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Water, vacancies, and competing exchange interactions in Prussian blue analogues: a neutron diffraction study of field and dehydration-driven magnetic transitions",
  "title_text": "Water, vacancies, and competing exchange interactions in Prussian blue analogues: a neutron diffraction study of field and dehydration-driven magnetic transitions",
  "type": "preprint",
  "updated_at": "2026-11-08T12:20:49Z",
  "url": "https://research.draconitic.com/paper/a7gwz6w5hz3xj",
  "venue": "arXiv",
  "versions": []
}