{
  "abstract": "We report a comprehensive high temperature structural investigation of the B-site ordered double perovskite SrLaCoNbO$_6$ using combined Raman spectroscopy and x-ray diffraction (XRD) over the range 25--900~$^\\circ$C. Two distinct temperature-driven anomalies are identified at $T_\\mathrm{OD} = 300\\pm 25~^\\circ$C and $T_\\mathrm{PT} = 750\\pm 25~^\\circ$C through pronounced renormalizations in the phonon frequency and linewidth, accompanied by the evolution and suppression of characteristic XRD reflections. The low-temperature anomaly at $T_\\mathrm{OD}$ is associated with an isostructural octahedral distortion within the monoclinic $P2_1/n$ phase. At $T_\\mathrm{OD}$, the radial and angular distortion parameters of the CoO$_6$ and NbO$_6$ octahedra decrease to near-zero values before reversing upon further heating due to an inversion of the in-plane Co--O and Nb--O bond-length hierarchy. The high-temperature anomaly at $T_\\mathrm{PT}$ corresponds to a symmetry-breaking structural phase transition from $P2_1/n$ to the monoclinic $I2/m$ phase, confirmed by group-theoretical analysis and Rietveld refinement. These results demonstrate that integrating temperature-dependent Raman spectroscopy with laboratory-based XRD, complemented by quantitative octahedral distortion analysis, provides a robust approach to disentangle isostructural octahedral distortions from symmetry-breaking phase transitions in complex double perovskite oxides without recourse to synchrotron or neutron diffraction facilities.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.37835",
  "author_total": 4,
  "authors": [
    {
      "name": "Ajay Kumar"
    },
    {
      "name": "Clemens Ulrich"
    },
    {
      "name": "Yaroslav Mudryk"
    },
    {
      "name": "Rajendra S. Dhaka"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/asztadcv210ab.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.37835",
  "fulltext_url": null,
  "id": "asztadcv210ab",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.37835",
  "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.mtrl-sci"
    ],
    [
      "arxiv",
      "physics.app-ph"
    ],
    [
      "openalex",
      "2504|Magnetic and transport properties of perovskites and related materials"
    ]
  ],
  "openalex": "W7214975578",
  "pdf_url": "https://arxiv.org/pdf/2609.37835",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/asztadcv210ab.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.37835",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.37835"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.app-ph",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Disentangling octahedral distortion and symmetry breaking in the ordered double perovskite SrLaCoNbO$_6$",
  "title_text": "Disentangling octahedral distortion and symmetry breaking in the ordered double perovskite SrLaCoNbO_6",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:30Z",
  "url": "https://research.draconitic.com/paper/asztadcv210ab",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/54pd-ry7l",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}