Interlayer hybridization enables superconductivity in bilayer nickelates
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
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2026
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| _version_ | 1866911600573677568 |
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| author | Zhang, Shilong Zhang, Meng Luo, Qilin Tao, Zihao Huang, Hsiao-Yu Li, Kunhao Channagowdra, Ganesha Li, Jie Fu, Junchi Huang, Di-Jing Xie, Yanwu Lu, Yi Peng, Yingying |
| author_facet | Zhang, Shilong Zhang, Meng Luo, Qilin Tao, Zihao Huang, Hsiao-Yu Li, Kunhao Channagowdra, Ganesha Li, Jie Fu, Junchi Huang, Di-Jing Xie, Yanwu Lu, Yi Peng, Yingying |
| contents | Ruddlesden-Popper nickelates offer a new route to high-temperature superconductivity beyond the cuprates and iron-pnictides. However, the electronic reorganization that enables superconductivity in bilayer nickelates remain unresolved, largely due to the difficulty of directly probing the superconducting phase. Here, we overcome this limitation by stabilizing superconducting (La,Pr)$_3$Ni$_2$O$_7$ thin films with a protective capping layer, thereby enabling direct spectroscopic access via X-ray absorption and resonant inelastic X-ray scattering. We resolve the evolution of in-plane and out-of-plane electronic states, spin and orbital excitations, and spin-density-waves across insulating, superconducting, and metallic regimes. Combining experimental results with theoretical analysis, we show that the in-plane $d_{x^2-y^2}$ states form an itinerant backbone, while superconductivity emerges only when coherent $d_{z^2}$-$p_z$-$d_{z^2}$ interlayer hybridization develops, accompanied by suppressed static spin order and strongly damped spin excitations. Oxygen stoichiometry and epitaxial strain both act on this interlayer channel, placing superconductivity within a narrow window of interlayer coherence and correlation strength. These findings identify the microscopic ingredients required for superconductivity in bilayer nickelates and provide a multiorbital picture of its emergence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_14701 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Interlayer hybridization enables superconductivity in bilayer nickelates Zhang, Shilong Zhang, Meng Luo, Qilin Tao, Zihao Huang, Hsiao-Yu Li, Kunhao Channagowdra, Ganesha Li, Jie Fu, Junchi Huang, Di-Jing Xie, Yanwu Lu, Yi Peng, Yingying Superconductivity Strongly Correlated Electrons Ruddlesden-Popper nickelates offer a new route to high-temperature superconductivity beyond the cuprates and iron-pnictides. However, the electronic reorganization that enables superconductivity in bilayer nickelates remain unresolved, largely due to the difficulty of directly probing the superconducting phase. Here, we overcome this limitation by stabilizing superconducting (La,Pr)$_3$Ni$_2$O$_7$ thin films with a protective capping layer, thereby enabling direct spectroscopic access via X-ray absorption and resonant inelastic X-ray scattering. We resolve the evolution of in-plane and out-of-plane electronic states, spin and orbital excitations, and spin-density-waves across insulating, superconducting, and metallic regimes. Combining experimental results with theoretical analysis, we show that the in-plane $d_{x^2-y^2}$ states form an itinerant backbone, while superconductivity emerges only when coherent $d_{z^2}$-$p_z$-$d_{z^2}$ interlayer hybridization develops, accompanied by suppressed static spin order and strongly damped spin excitations. Oxygen stoichiometry and epitaxial strain both act on this interlayer channel, placing superconductivity within a narrow window of interlayer coherence and correlation strength. These findings identify the microscopic ingredients required for superconductivity in bilayer nickelates and provide a multiorbital picture of its emergence. |
| title | Interlayer hybridization enables superconductivity in bilayer nickelates |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.14701 |