Skip to content
DraconiticResearch
Search Sources API
182,469 studies31 sourcesUpdated 17 min ago
PreprintCC BY 4.0arXiv

RIXS study of strain-tuned coupled valence and spin-state transition in epitaxial (Pr0.85Y0.15)0.7Ca0.3CoO3 films

  • Yiu-Fung Chiu
  • Jaewon Choi
  • Nileena Nandakumaran
  • Mirian Garcia-Fernandez
  • Jonathan Pelliciari
  • Shiyu Fan
  • Valentina Bisogni
  • Chris Leighton
  • Ke-Jin Zhou
  • Stefano Agrestini
Open at sourcePDFDOICite

Abstract

Strain-tuned (Pr0.85Y0.15)0.7Ca0.3CoO3 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 L2,3 and Pr M4,5 X-ray Absorption Spectroscopy (XAS), along with Co L3 edge Resonant Inelastic X-ray Scattering (RIXS), to probe the local electronic structure across the strain-controlled VSST in epitaxial (Pr,Y,Ca)CoO3 thin films. In compressively strained films on YAlO3 (YAO) substrates, cooling through the transition produces Pr4+-like spectral weight, suppresses Co4+-like character, and favors predominantly low-spin Co3+. 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 La0.18Sr0.82Al0.59Ta0.41O3 (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 Co4+-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.

Related

  1. Strain engineering of altermagnetic symmetry in epitaxial RuO 2 films
    Anonymous, Seung Gyo Jeong, Anand Santhosh +3
    Physical review. B./Physical review. BPeer-reviewedLicence not statedFull text9 citedAtomic, molecular & optical physicsOpenAlex
  2. Disentangling Strain and Ti3+ Contributions to the Anomalous Hall Effect in Epitaxial RuO2 Films
    S. G. Jeong, A. Santhosh, S. Lee +7
    arXivPreprintCC BY 4.0Full textCondensed matterarXiv
  3. Structural stability, electronic structure, and magnetism of the d9 double infinite-layer La3Ni2O5F under chemical pressure and epitaxial strain
    K. Madani, Q. Meier, A. Cano
    HALPreprintCC BY-NC-SAFull textCondensed matterHAL
  4. Epitaxial growth of strain-relaxed GeSn alloys on Si utilizing Sn-composition-graded buffer layer for mid-infrared photodetectors
    Kuo-Chih Lee, Ping-Chien Hsieh, Yue-Tong Jheng +9
    Optical MaterialsPeer-reviewedCC BY-NC-ND 4.0Full textGeneral physicsHAL
  5. Strain-Tuned Nodal Superconductivity in the Charge-Ordered Kagome Metal CsV3Sb5
    Yusuke Takeuchi, Akito Kobayashi, Saki Uchida +8
    arXivPreprintarXiv licenceFull textCondensed matterarXiv

Cite

BibTeXRIS
BibTeX
@misc{chiu2026rixs,
  title = {{RIXS study of strain-tuned coupled valence and spin-state transition in epitaxial $(\mathrmPr_0.85\mathrmY_0.15)_0.7\mathrmCa_0.3\mathrmCoO_3$ films}},
  author = {Yiu-Fung Chiu and Jaewon Choi and Nileena Nandakumaran and Mirian Garcia-Fernandez and Jonathan Pelliciari and Shiyu Fan and Valentina Bisogni and Chris Leighton and Ke-Jin Zhou and Stefano Agrestini},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.00540},
  eprint = {2611.00540},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.00540},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - RIXS study of strain-tuned coupled valence and spin-state transition in epitaxial (Pr_0.85Y_0.15)_0.7Ca_0.3CoO_3 films
AU  - Yiu-Fung Chiu
AU  - Jaewon Choi
AU  - Nileena Nandakumaran
AU  - Mirian Garcia-Fernandez
AU  - Jonathan Pelliciari
AU  - Shiyu Fan
AU  - Valentina Bisogni
AU  - Chris Leighton
AU  - Ke-Jin Zhou
AU  - Stefano Agrestini
PY  - 2026
DA  - 2026/11/01
PB  - arXiv
DO  - 10.48550/arxiv.2611.00540
UR  - https://arxiv.org/abs/2611.00540
AB  - Strain-tuned (Pr_0.85Y_0.15)_0.7Ca_0.3CoO_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_0.18Sr_0.82Al_0.59Ta_0.41O_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.
ER  -