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Sensitive dependence of pairing symmetry on Ni-eg crystal field splitting in the nickelate superconductor La3Ni2O7

Author

Listed:
  • Chengliang Xia

    (NYU Shanghai)

  • Hongquan Liu

    (NYU Shanghai
    Brown University)

  • Shengjie Zhou

    (NYU Shanghai)

  • Hanghui Chen

    (NYU Shanghai
    New York University)

Abstract

The discovery of high-temperature superconductivity in La3Ni2O7 under pressure has drawn great attention. However, consensus has not been reached on its pairing symmetry in theory. By combining density-functional-theory (DFT), maximally-localized-Wannier-function, and linearized gap equation with random-phase-approximation, we find that the pairing symmetry of La3Ni2O7 is dxy, if its DFT band structure is accurately reproduced by a downfolded bilayer two-orbital model. More importantly, we reveal that the pairing symmetry of La3Ni2O7 sensitively depends on the crystal field splitting between two Ni-eg orbitals. A slight increase in Ni-eg crystal field splitting alters the pairing symmetry from dxy to s±. Such a transition is associated with the change in inverse Fermi velocity and susceptibility, while the shape of Fermi surface remains almost unchanged. Our work highlights the sensitive dependence of pairing symmetry on low-energy electronic structures in multi-orbital superconductors, which calls for care in the downfolding procedure when one calculates their pairing symmetry.

Suggested Citation

  • Chengliang Xia & Hongquan Liu & Shengjie Zhou & Hanghui Chen, 2025. "Sensitive dependence of pairing symmetry on Ni-eg crystal field splitting in the nickelate superconductor La3Ni2O7," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-56206-0
    DOI: 10.1038/s41467-025-56206-0
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    1. Jiangang Yang & Hualei Sun & Xunwu Hu & Yuyang Xie & Taimin Miao & Hailan Luo & Hao Chen & Bo Liang & Wenpei Zhu & Gexing Qu & Cui-Qun Chen & Mengwu Huo & Yaobo Huang & Shenjin Zhang & Fengfeng Zhang , 2024. "Orbital-dependent electron correlation in double-layer nickelate La3Ni2O7," Nature Communications, Nature, vol. 15(1), pages 1-8, 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. 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.
    4. Hualei Sun & Mengwu Huo & Xunwu Hu & Jingyuan Li & Zengjia Liu & Yifeng Han & Lingyun Tang & Zhongquan Mao & Pengtao Yang & Bosen Wang & Jinguang Cheng & Dao-Xin Yao & Guang-Ming Zhang & Meng Wang, 2023. "Signatures of superconductivity near 80 K in a nickelate under high pressure," Nature, Nature, vol. 621(7979), pages 493-498, September.
    5. Hanghui Chen & Yi-feng Yang & Guang-Ming Zhang & Hongquan Liu, 2023. "An electronic origin of charge order in infinite-layer nickelates," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
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