{
  "abstract": "Strain-tuned $(\\mathrm{Pr}_{0.85}\\mathrm{Y}_{0.15})_{0.7}\\mathrm{Ca}_{0.3}\\mathrm{CoO}_{3}$ thin films provide a model system for controlling coupled valence, spin-state, structural and metal-insulator transitions (VSSTs) in perovskite cobaltite materials. Here, we use Co $L_{2,3}$ and Pr $M_{4,5}$ X-ray Absorption Spectroscopy (XAS), along with Co $L_{3}$ edge Resonant Inelastic X-ray Scattering (RIXS), to probe the local electronic structure across the strain-controlled VSST in epitaxial (Pr,Y,Ca)CoO$_{3}$ thin films. In compressively strained films on YAlO$_{3}$ (YAO) substrates, cooling through the transition produces Pr$^{4+}$-like spectral weight, suppresses Co$^{4+}$-like character, and favors predominantly low-spin Co$^{3+}$. The changes at the Pr and Co edges are quantitatively consistent with a reduction of approximately 0.15 holes per Co in the Co--O network. By contrast, tensile-strained thin films on La$_{0.18}$Sr$_{0.82}$Al$_{0.59}$Ta$_{0.41}$O$_{3}$ (LSAT) substrates have nearly temperature-independent spectra. Multiplet calculations reproduce the principal XAS lineshapes and local $dd$ excitations at high energy loss. Additionally, low-energy RIXS intensity recovered above the transition is consistent with a combination of Co$^{4+}$-like local excitations and a broader particle--hole continuum associated with the metallic phase. These results provide element-resolved evidence for charge compensation between the Pr and Co--O sublattices and support cooperative coupling among charge-transfer, spin-state, and lattice structure at the strain-controlled VSST.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.00540",
  "author_total": 10,
  "authors": [
    {
      "name": "Yiu-Fung Chiu"
    },
    {
      "name": "Jaewon Choi"
    },
    {
      "name": "Nileena Nandakumaran"
    },
    {
      "name": "Mirian Garcia-Fernandez"
    },
    {
      "name": "Jonathan Pelliciari"
    },
    {
      "name": "Shiyu Fan"
    },
    {
      "name": "Valentina Bisogni"
    },
    {
      "name": "Chris Leighton"
    },
    {
      "name": "Ke-Jin Zhou"
    },
    {
      "name": "Stefano Agrestini"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2d4dhdvd54rja.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.00540",
  "fulltext_url": null,
  "id": "2d4dhdvd54rja",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.00540",
  "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",
      "cond-mat.str-el"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.00540",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2d4dhdvd54rja.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:59Z",
      "native_id": "2611.00540",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.00540"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "RIXS study of strain-tuned coupled valence and spin-state transition in epitaxial $(\\mathrm{Pr}_{0.85}\\mathrm{Y}_{0.15})_{0.7}\\mathrm{Ca}_{0.3}\\mathrm{CoO}_{3}$ films",
  "title_text": "RIXS study of strain-tuned coupled valence and spin-state transition in epitaxial (Pr_0.85Y_0.15)_0.7Ca_0.3CoO_3 films",
  "type": "preprint",
  "updated_at": "2026-11-04T15:20:57Z",
  "url": "https://research.draconitic.com/paper/2d4dhdvd54rja",
  "venue": "arXiv",
  "versions": []
}