| Autor: |
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 |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Physical Review X, Vol 13, Iss 1, p 011021 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2160-3308 |
| DOI: |
10.1103/PhysRevX.13.011021 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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