Orbital inversion and emergent lattice dynamics in infinite layer CaCoO$_2$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909023097323520 |
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| author | Jost, Daniel Lomeli, Eder G. Kim, Woo Jin Been, Emily M. Rossi, Matteo Agrestini, Stefano Zhou, Kejin Jia, Chunjing Moritz, Brian Shen, Zhi-Xun Hwang, Harold Y. Devereaux, Thomas P. Lee, Wei-Sheng |
| author_facet | Jost, Daniel Lomeli, Eder G. Kim, Woo Jin Been, Emily M. Rossi, Matteo Agrestini, Stefano Zhou, Kejin Jia, Chunjing Moritz, Brian Shen, Zhi-Xun Hwang, Harold Y. Devereaux, Thomas P. Lee, Wei-Sheng |
| contents | The layered cobaltate CaCoO$_2$ exhibits a unique herringbone-like structure. Serving as a potential prototype for a new class of complex lattice patterns, we study the properties of CaCoO$_2$ using X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS). Our results reveal a significant inter-plane hybridization between the Ca $4s-$ and Co $3d-$orbitals, leading to an inversion of the textbook orbital occupation of a square planar geometry. Further, our RIXS data reveal a strong low energy mode, with anomalous intensity modulations as a function of momentum transfer close to a quasi-static response suggestive of electronic and/or orbital ordering. These findings indicate that the newly discovered herringbone structure exhibited in CaCoO$_2$ may serve as a promising laboratory for the design of materials having strong electronic, orbital and lattice correlations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_07705 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Orbital inversion and emergent lattice dynamics in infinite layer CaCoO$_2$ Jost, Daniel Lomeli, Eder G. Kim, Woo Jin Been, Emily M. Rossi, Matteo Agrestini, Stefano Zhou, Kejin Jia, Chunjing Moritz, Brian Shen, Zhi-Xun Hwang, Harold Y. Devereaux, Thomas P. Lee, Wei-Sheng Strongly Correlated Electrons Materials Science The layered cobaltate CaCoO$_2$ exhibits a unique herringbone-like structure. Serving as a potential prototype for a new class of complex lattice patterns, we study the properties of CaCoO$_2$ using X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS). Our results reveal a significant inter-plane hybridization between the Ca $4s-$ and Co $3d-$orbitals, leading to an inversion of the textbook orbital occupation of a square planar geometry. Further, our RIXS data reveal a strong low energy mode, with anomalous intensity modulations as a function of momentum transfer close to a quasi-static response suggestive of electronic and/or orbital ordering. These findings indicate that the newly discovered herringbone structure exhibited in CaCoO$_2$ may serve as a promising laboratory for the design of materials having strong electronic, orbital and lattice correlations. |
| title | Orbital inversion and emergent lattice dynamics in infinite layer CaCoO$_2$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2409.07705 |