Electronic and magnetic excitations in La3Ni2O7

Xiaoyang Chen, Jaewon Choi, Zhicheng Jiang, Jiong Mei, Kun Jiang, Jie Li, Stefano Agrestini, Mirian Garcia-Fernandez, Hualei Sun, Xing Huang, Dawei Shen, Meng Wang, Jiangping Hu, Yi Lu (), Ke-Jin Zhou () and Donglai Feng ()
Additional contact information
Xiaoyang Chen: Fudan University
Jaewon Choi: Diamond Light Source
Zhicheng Jiang: University of Science and Technology of China
Jiong Mei: Chinese Academy of Sciences
Kun Jiang: Chinese Academy of Sciences
Jie Li: Nanjing University
Stefano Agrestini: Diamond Light Source
Mirian Garcia-Fernandez: Diamond Light Source
Hualei Sun: Sun Yat-Sen University
Xing Huang: Sun Yat-Sen University
Dawei Shen: University of Science and Technology of China
Meng Wang: Sun Yat-Sen University
Jiangping Hu: Chinese Academy of Sciences
Yi Lu: Nanjing University
Ke-Jin Zhou: Diamond Light Source
Donglai Feng: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract High-temperature superconductivity was discovered in the pressurized nickelate La3Ni2O7 which has a unique bilayer structure and mixed valence state of nickel. The properties at ambient pressure contain crucial information of the fundamental interactions and bosons mediating superconducting pairing. Here, using X-ray absorption spectroscopy and resonant inelastic X-ray scattering, we identified that Ni 3 $${d}_{{x}^{2}-{y}^{2}}$$ d x 2 − y 2 , Ni 3 $${d}_{{z}^{2}}$$ d z 2 , and ligand oxygen 2p orbitals dominate the low-energy physics with a small charge-transfer energy. Well-defined optical-like magnetic excitations soften into quasi-static spin-density-wave ordering, evidencing the strong electronic correlation and rich magnetic properties. Based on an effective Heisenberg spin model, we extract a much stronger inter-layer effective magnetic superexchange than the intra-layer ones and propose two viable magnetic structures. Our findings emphasize that the Ni 3 $${d}_{{z}^{2}}$$ d z 2 orbital bonding within the bilayer induces novel electronic and magnetic excitations, setting the stage for further exploration of La3Ni2O7 superconductor.

Date: 2024
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DOI: 10.1038/s41467-024-53863-5

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