Source code and data files for the manuscript Electronic character of charge order in square planar low valence nickelates. Execute plot.ipynb to view the data.
If this data is used, please cite Electronic character of charge order in square planar low valence nickelates, 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, and M. P. M. Dean, Phys. Rev. X. 13, 011021 (2023)
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_{\sigma} 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_{\sigma}, 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.
Work with this by installing docker and pip and then running
pip install jupyter-repo2docker
jupyter-repo2docker --editable .Change tree to lab in the URL for JupyterLab.
