Superconductivity and Electronic Structures of Nickelate Thin Film Superstructures
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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910123909185536 |
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| author | Nie, Zihao Li, Yueying Lv, Wei Xu, Lizhi Jiang, Zhicheng Fu, Peng Zhou, Guangdi Song, Wenhua Chen, Yaqi Wang, Heng Huang, Haoliang Lin, Junhao Jia, Jin-Feng Shen, Dawei Li, Peng Xue, Qi-Kun Chen, Zhuoyu |
| author_facet | Nie, Zihao Li, Yueying Lv, Wei Xu, Lizhi Jiang, Zhicheng Fu, Peng Zhou, Guangdi Song, Wenhua Chen, Yaqi Wang, Heng Huang, Haoliang Lin, Junhao Jia, Jin-Feng Shen, Dawei Li, Peng Xue, Qi-Kun Chen, Zhuoyu |
| contents | Ruddlesden-Popper (RP) nickelates have emerged as a crucial platform for exploring the mechanisms of high-temperature superconductivity. However, the Fermi surface topology required for superconductivity remains elusive. Here, beyond the superconducting pure bilayer (2222) phase, we report the thin film growth and ambient-pressure superconductivity of monolayer-bilayer (1212) and bilayer-trilayer (2323) superstructures, together with the absence of superconductivity in monolayer-trilayer (1313) superstructure, under identical compressive epitaxial strain. The onset superconducting transition temperatures range from 46 to 50 K, exceeding the McMillan limit. Angle-resolved photoemission spectroscopy reveals key Fermi surface differences in these atomically-engineered structures. In superconducting 1212 and 2222 films, a dispersive hole-like band ($γ^{\mathrm{II}}$) forms an underlying Fermi pocket, surrounding the Brillouin zone corner. In contrast, the top of the flat band ($γ^{\mathrm{III}}$) is observed ~70 meV below $E_\text{F}$ in the non-superconducting 1313 films. Particularly, the superconducting 2323 films host both $γ^{\mathrm{II}}$ and $γ^{\mathrm{III}}$ bands. The polarization dependence of the $γ$ bands reveals their Ni $d_{z^2}$ origin. Our findings expand the family of ambient-pressure nickelate superconductors and establish a connection between structural configuration, electronic structure, and the emergence of superconductivity in nickelates. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_03502 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superconductivity and Electronic Structures of Nickelate Thin Film Superstructures Nie, Zihao Li, Yueying Lv, Wei Xu, Lizhi Jiang, Zhicheng Fu, Peng Zhou, Guangdi Song, Wenhua Chen, Yaqi Wang, Heng Huang, Haoliang Lin, Junhao Jia, Jin-Feng Shen, Dawei Li, Peng Xue, Qi-Kun Chen, Zhuoyu Superconductivity Ruddlesden-Popper (RP) nickelates have emerged as a crucial platform for exploring the mechanisms of high-temperature superconductivity. However, the Fermi surface topology required for superconductivity remains elusive. Here, beyond the superconducting pure bilayer (2222) phase, we report the thin film growth and ambient-pressure superconductivity of monolayer-bilayer (1212) and bilayer-trilayer (2323) superstructures, together with the absence of superconductivity in monolayer-trilayer (1313) superstructure, under identical compressive epitaxial strain. The onset superconducting transition temperatures range from 46 to 50 K, exceeding the McMillan limit. Angle-resolved photoemission spectroscopy reveals key Fermi surface differences in these atomically-engineered structures. In superconducting 1212 and 2222 films, a dispersive hole-like band ($γ^{\mathrm{II}}$) forms an underlying Fermi pocket, surrounding the Brillouin zone corner. In contrast, the top of the flat band ($γ^{\mathrm{III}}$) is observed ~70 meV below $E_\text{F}$ in the non-superconducting 1313 films. Particularly, the superconducting 2323 films host both $γ^{\mathrm{II}}$ and $γ^{\mathrm{III}}$ bands. The polarization dependence of the $γ$ bands reveals their Ni $d_{z^2}$ origin. Our findings expand the family of ambient-pressure nickelate superconductors and establish a connection between structural configuration, electronic structure, and the emergence of superconductivity in nickelates. |
| title | Superconductivity and Electronic Structures of Nickelate Thin Film Superstructures |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2509.03502 |