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Electronic and magnetic excitations in La3Ni2O7

Author

Listed:
  • Xiaoyang Chen

    (Fudan University)

  • Jaewon Choi

    (Diamond Light Source)

  • Zhicheng Jiang

    (University of Science and Technology of China)

  • Jiong Mei

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Kun Jiang

    (Chinese Academy of Sciences
    University of 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
    New Cornerstone Science Laboratory)

  • Yi Lu

    (Nanjing University
    Collaborative Innovation Center of Advanced Microstructures)

  • Ke-Jin Zhou

    (Diamond Light Source)

  • Donglai Feng

    (University of Science and Technology of China
    Collaborative Innovation Center of Advanced Microstructures
    University of Science and Technology of China)

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.

Suggested Citation

  • 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 & , 2024. "Electronic and magnetic excitations in La3Ni2O7," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53863-5
    DOI: 10.1038/s41467-024-53863-5
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    References listed on IDEAS

    as
    1. Yang Zhang & Ling-Fang Lin & Adriana Moreo & Thomas A. Maier & Elbio Dagotto, 2024. "Structural phase transition, s±-wave pairing, and magnetic stripe order in bilayered superconductor La3Ni2O7 under pressure," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    2. Zhe Liu & Mengwu Huo & Jie Li & Qing Li & Yuecong Liu & Yaomin Dai & Xiaoxiang Zhou & Jiahao Hao & Yi Lu & Meng Wang & Hai-Hu Wen, 2024. "Electronic correlations and partial gap in the bilayer nickelate La3Ni2O7," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    3. B. Keimer & S. A. Kivelson & M. R. Norman & S. Uchida & J. Zaanen, 2015. "From quantum matter to high-temperature superconductivity in copper oxides," Nature, Nature, vol. 518(7538), pages 179-186, February.
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