Electronic Character of Charge Order in Square-Planar Low-Valence Nickelates
Charge order is a central feature of the physics of cuprate superconductors and is known to arise from a modulation of holes with primarily oxygen character. Low-valence nickelate superconductors also host charge order, but the electronic character of this symmetry breaking is unsettled. Here, using...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2023-02-01
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| Series: | Physical Review X |
| Online Access: | http://doi.org/10.1103/PhysRevX.13.011021 |
| _version_ | 1797901353070100480 |
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| author | Y. Shen J. Sears G. Fabbris J. Li J. Pelliciari M. Mitrano W. He Junjie Zhang J. F. Mitchell V. Bisogni M. R. Norman S. Johnston M. P. M. Dean |
| author_facet | Y. Shen J. Sears G. Fabbris J. Li J. Pelliciari M. Mitrano W. He Junjie Zhang J. F. Mitchell V. Bisogni M. R. Norman S. Johnston M. P. M. Dean |
| author_sort | Y. Shen |
| collection | DOAJ |
| description | Charge order is a central feature of the physics of cuprate superconductors and is known to arise from a modulation of holes with primarily oxygen character. Low-valence nickelate superconductors also host charge order, but the electronic character of this symmetry breaking is unsettled. Here, using resonant inelastic x-ray scattering at the Ni L_{2} edge, we identify intertwined involvements of Ni 3d_{x^{2}-y^{2}}, 3d_{3z^{2}-r^{2}}, and O 2p_{σ} orbitals in the formation of diagonal charge order in an overdoped low-valence nickelate La_{4}Ni_{3}O_{8}. The Ni 3d_{x^{2}-y^{2}} orbitals, strongly hybridized with planar O 2p_{σ}, largely shape the spatial charge distribution and lead to Ni site-centered charge order. The 3d_{3z^{2}-r^{2}} orbitals play a small, but non-negligible role in the charge order as they hybridize with the rare-earth 5d orbitals. Our results reveal that the low-energy physics and ground-state character of these nickelates are more complex than those in cuprates. |
| first_indexed | 2024-04-10T09:00:45Z |
| format | Article |
| id | doaj.art-1f46d6b8d92445beaa20cdcc2063db9d |
| institution | Directory Open Access Journal |
| issn | 2160-3308 |
| language | English |
| last_indexed | 2024-04-10T09:00:45Z |
| publishDate | 2023-02-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review X |
| spelling | doaj.art-1f46d6b8d92445beaa20cdcc2063db9d2023-02-21T15:08:54ZengAmerican Physical SocietyPhysical Review X2160-33082023-02-0113101102110.1103/PhysRevX.13.011021Electronic Character of Charge Order in Square-Planar Low-Valence NickelatesY. ShenJ. SearsG. FabbrisJ. LiJ. PelliciariM. MitranoW. HeJunjie ZhangJ. F. MitchellV. BisogniM. R. NormanS. JohnstonM. P. M. DeanCharge order is a central feature of the physics of cuprate superconductors and is known to arise from a modulation of holes with primarily oxygen character. Low-valence nickelate superconductors also host charge order, but the electronic character of this symmetry breaking is unsettled. Here, using resonant inelastic x-ray scattering at the Ni L_{2} edge, we identify intertwined involvements of Ni 3d_{x^{2}-y^{2}}, 3d_{3z^{2}-r^{2}}, and O 2p_{σ} orbitals in the formation of diagonal charge order in an overdoped low-valence nickelate La_{4}Ni_{3}O_{8}. The Ni 3d_{x^{2}-y^{2}} orbitals, strongly hybridized with planar O 2p_{σ}, largely shape the spatial charge distribution and lead to Ni site-centered charge order. The 3d_{3z^{2}-r^{2}} orbitals play a small, but non-negligible role in the charge order as they hybridize with the rare-earth 5d orbitals. Our results reveal that the low-energy physics and ground-state character of these nickelates are more complex than those in cuprates.http://doi.org/10.1103/PhysRevX.13.011021 |
| spellingShingle | Y. Shen J. Sears G. Fabbris J. Li J. Pelliciari M. Mitrano W. He Junjie Zhang J. F. Mitchell V. Bisogni M. R. Norman S. Johnston M. P. M. Dean Electronic Character of Charge Order in Square-Planar Low-Valence Nickelates Physical Review X |
| title | Electronic Character of Charge Order in Square-Planar Low-Valence Nickelates |
| title_full | Electronic Character of Charge Order in Square-Planar Low-Valence Nickelates |
| title_fullStr | Electronic Character of Charge Order in Square-Planar Low-Valence Nickelates |
| title_full_unstemmed | Electronic Character of Charge Order in Square-Planar Low-Valence Nickelates |
| title_short | Electronic Character of Charge Order in Square-Planar Low-Valence Nickelates |
| title_sort | electronic character of charge order in square planar low valence nickelates |
| url | http://doi.org/10.1103/PhysRevX.13.011021 |
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