Ni-O hybridization-driven electronic reconstruction across the superconducting dome in an infinite-layer nickelate
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866916064159334400 |
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| author | Tang, Chi Sin Zeng, Shengwei Gao, Xing Luo, Zhaoyang Liu, Xiongfang Lim, Zhi Shiuh Prakash, Saurav Yang, Ping Diao, Caozheng Yin, Xinmao Li, Changjian Liu, Huajun Breese, Mark B. H. Ariando, A. |
| author_facet | Tang, Chi Sin Zeng, Shengwei Gao, Xing Luo, Zhaoyang Liu, Xiongfang Lim, Zhi Shiuh Prakash, Saurav Yang, Ping Diao, Caozheng Yin, Xinmao Li, Changjian Liu, Huajun Breese, Mark B. H. Ariando, A. |
| contents | Superconductivity in infinite-layer nickelates has drawn wide interest as a cuprate analogue, yet how the electronic structure evolves with hole doping remains unsettled. Here we map the doping- and temperature-dependent unoccupied states of the La-based infinite-layer nickelate La1-xCaxNiO2 using O K-edge and Ni L-edge x-ray absorption spectroscopy. Superconductivity occurs for 0.18<=x<=0.27. Near x~0.20-0.23, low-energy spectral weight redistributes: Ni3d-dominated states decrease while O2p-hybridized states increase, indicating an orbital-selective crossover in Ni-O covalency. This crossover coincides with a sign reversal of the Hall coefficient and precedes the reduction of the superconducting critical temperature at higher doping. By directly linking transport anomalies and the superconducting dome to a measurable Ni-O orbital reorganization, our results provide a key step toward a unified, orbital-resolved phase diagram for infinite-layer nickelates and a practical route to engineer superconductivity via hybridization control. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_30752 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ni-O hybridization-driven electronic reconstruction across the superconducting dome in an infinite-layer nickelate Tang, Chi Sin Zeng, Shengwei Gao, Xing Luo, Zhaoyang Liu, Xiongfang Lim, Zhi Shiuh Prakash, Saurav Yang, Ping Diao, Caozheng Yin, Xinmao Li, Changjian Liu, Huajun Breese, Mark B. H. Ariando, A. Superconductivity Strongly Correlated Electrons Superconductivity in infinite-layer nickelates has drawn wide interest as a cuprate analogue, yet how the electronic structure evolves with hole doping remains unsettled. Here we map the doping- and temperature-dependent unoccupied states of the La-based infinite-layer nickelate La1-xCaxNiO2 using O K-edge and Ni L-edge x-ray absorption spectroscopy. Superconductivity occurs for 0.18<=x<=0.27. Near x~0.20-0.23, low-energy spectral weight redistributes: Ni3d-dominated states decrease while O2p-hybridized states increase, indicating an orbital-selective crossover in Ni-O covalency. This crossover coincides with a sign reversal of the Hall coefficient and precedes the reduction of the superconducting critical temperature at higher doping. By directly linking transport anomalies and the superconducting dome to a measurable Ni-O orbital reorganization, our results provide a key step toward a unified, orbital-resolved phase diagram for infinite-layer nickelates and a practical route to engineer superconductivity via hybridization control. |
| title | Ni-O hybridization-driven electronic reconstruction across the superconducting dome in an infinite-layer nickelate |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.30752 |