Spin-orbit-entangled state of Ba2CaOsO6 studied by O K-edge resonant inelastic X-ray scattering and Raman spectroscopy
Abstract Transition-metal ions with 5d 2 electronic configuration in a cubic crystal field are prone to have a vanishing dipolar magnetic moment but finite higher-order multipolar moments, and they are expected to exhibit exotic physical properties. Through an investigation using resonant inelastic...
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Nature Portfolio
2025-04-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-025-00757-4 |
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| author | J. Okamoto G. Shibata Yu. S. Ponosov H. Hayashi K. Yamaura H. Y. Huang A. Singh C. T. Chen A. Tanaka S. V. Streltsov D. J. Huang A. Fujimori |
| author_facet | J. Okamoto G. Shibata Yu. S. Ponosov H. Hayashi K. Yamaura H. Y. Huang A. Singh C. T. Chen A. Tanaka S. V. Streltsov D. J. Huang A. Fujimori |
| author_sort | J. Okamoto |
| collection | DOAJ |
| description | Abstract Transition-metal ions with 5d 2 electronic configuration in a cubic crystal field are prone to have a vanishing dipolar magnetic moment but finite higher-order multipolar moments, and they are expected to exhibit exotic physical properties. Through an investigation using resonant inelastic X-ray scattering (RIXS), Raman spectroscopy, and theoretical ligand-field (LF) multiplet and ab initio calculations, we fully characterized the local electronic structure of Ba2CaOsO6, particularly, the crystal-field symmetry of the 5d 2 electrons in this anomalous material. The low-energy multiplet excitations from RIXS at the oxygen K edge and Raman-active phonons both show no splitting. These findings are consistent with the ground state of Os ions dominated by magnetic octupoles. Obtained parameters pave the way for further realistic microscopic studies of this highly unusual class of materials, advancing our understanding of spin-orbit physics in systems with higher-order multipoles. |
| format | Article |
| id | doaj-art-a6c1c333c1cc459494f0e6b471c62e2e |
| institution | OA Journals |
| issn | 2397-4648 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj-art-a6c1c333c1cc459494f0e6b471c62e2e2025-08-20T02:19:57ZengNature Portfolionpj Quantum Materials2397-46482025-04-011011810.1038/s41535-025-00757-4Spin-orbit-entangled state of Ba2CaOsO6 studied by O K-edge resonant inelastic X-ray scattering and Raman spectroscopyJ. Okamoto0G. Shibata1Yu. S. Ponosov2H. Hayashi3K. Yamaura4H. Y. Huang5A. Singh6C. T. Chen7A. Tanaka8S. V. Streltsov9D. J. Huang10A. Fujimori11National Synchrotron Radiation Research CenterMaterials Sciences Research Center, Japan Atomic Energy AgencyInstitute of Metal PhysicsResearch Center for Materials Nanoarchitectonics (MANA), National Institute for Materials ScienceResearch Center for Materials Nanoarchitectonics (MANA), National Institute for Materials ScienceNational Synchrotron Radiation Research CenterNational Synchrotron Radiation Research CenterNational Synchrotron Radiation Research CenterGraduate School of Advanced Science and Engineering, Hiroshima UniversityInstitute of Metal PhysicsNational Synchrotron Radiation Research CenterNational Synchrotron Radiation Research CenterAbstract Transition-metal ions with 5d 2 electronic configuration in a cubic crystal field are prone to have a vanishing dipolar magnetic moment but finite higher-order multipolar moments, and they are expected to exhibit exotic physical properties. Through an investigation using resonant inelastic X-ray scattering (RIXS), Raman spectroscopy, and theoretical ligand-field (LF) multiplet and ab initio calculations, we fully characterized the local electronic structure of Ba2CaOsO6, particularly, the crystal-field symmetry of the 5d 2 electrons in this anomalous material. The low-energy multiplet excitations from RIXS at the oxygen K edge and Raman-active phonons both show no splitting. These findings are consistent with the ground state of Os ions dominated by magnetic octupoles. Obtained parameters pave the way for further realistic microscopic studies of this highly unusual class of materials, advancing our understanding of spin-orbit physics in systems with higher-order multipoles.https://doi.org/10.1038/s41535-025-00757-4 |
| spellingShingle | J. Okamoto G. Shibata Yu. S. Ponosov H. Hayashi K. Yamaura H. Y. Huang A. Singh C. T. Chen A. Tanaka S. V. Streltsov D. J. Huang A. Fujimori Spin-orbit-entangled state of Ba2CaOsO6 studied by O K-edge resonant inelastic X-ray scattering and Raman spectroscopy npj Quantum Materials |
| title | Spin-orbit-entangled state of Ba2CaOsO6 studied by O K-edge resonant inelastic X-ray scattering and Raman spectroscopy |
| title_full | Spin-orbit-entangled state of Ba2CaOsO6 studied by O K-edge resonant inelastic X-ray scattering and Raman spectroscopy |
| title_fullStr | Spin-orbit-entangled state of Ba2CaOsO6 studied by O K-edge resonant inelastic X-ray scattering and Raman spectroscopy |
| title_full_unstemmed | Spin-orbit-entangled state of Ba2CaOsO6 studied by O K-edge resonant inelastic X-ray scattering and Raman spectroscopy |
| title_short | Spin-orbit-entangled state of Ba2CaOsO6 studied by O K-edge resonant inelastic X-ray scattering and Raman spectroscopy |
| title_sort | spin orbit entangled state of ba2caoso6 studied by o k edge resonant inelastic x ray scattering and raman spectroscopy |
| url | https://doi.org/10.1038/s41535-025-00757-4 |
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