Angle-resolved photoemission spectroscopy of superconducting (La,Pr)3Ni2O7/SrLaAlO4 heterostructures
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916776707620864 |
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| author | Li, Peng Zhou, Guangdi Lv, Wei Li, Yueying Yue, Changming Huang, Haoliang Xu, Lizhi Shen, Jianchang Miao, Yu Song, Wenhua Nie, Zihao Chen, Yaqi Wang, Heng Chen, Weiqiang Huang, Yaobo Chen, Zhen-Hua Qian, Tian Lin, Junhao He, Junfeng Sun, Yu-Jie Chen, Zhuoyu Xue, Qi-Kun |
| author_facet | Li, Peng Zhou, Guangdi Lv, Wei Li, Yueying Yue, Changming Huang, Haoliang Xu, Lizhi Shen, Jianchang Miao, Yu Song, Wenhua Nie, Zihao Chen, Yaqi Wang, Heng Chen, Weiqiang Huang, Yaobo Chen, Zhen-Hua Qian, Tian Lin, Junhao He, Junfeng Sun, Yu-Jie Chen, Zhuoyu Xue, Qi-Kun |
| contents | Ruddlesden-Popper bilayer nickelate thin film superconductors discovered under ambient pressure enable vast possibilities for investigating electronic structures of the superconducting state. Here, we report angle-resolved photoemission spectroscopy (ARPES) measurements of 1, 2, and 3 unit-cell epitaxial La2.85Pr0.15Ni2O7 films grown on SrLaAlO4 substates, through pure-oxygen in situ sample transportation. Evidence obtained using photons with distinct probing depths shows that conduction is localized primarily at the first unit cell near the interface. Scanning transmission electron microscopy (STEM), together with energy-dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), indicates that interfacial Sr diffusion and pronounced p-d hybridization gradient may collectively account for the interfacial confinement of conduction. Fermi surface maps reveal hole doping compared to non-superconducting ambient-pressure bulk crystals. Measurements of dispersive band structures suggest the contributions from both Ni dx2-y2 and dz2 orbitals at the Fermi level. Density functional theory (DFT) + U calculations capture qualitative features of the ARPES results, consistent with a hole-doped scenario. These findings constrain theoretical models of the superconducting mechanism and suggest potential for enhancing superconductivity in nickelates under ambient pressure. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_09255 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Angle-resolved photoemission spectroscopy of superconducting (La,Pr)3Ni2O7/SrLaAlO4 heterostructures Li, Peng Zhou, Guangdi Lv, Wei Li, Yueying Yue, Changming Huang, Haoliang Xu, Lizhi Shen, Jianchang Miao, Yu Song, Wenhua Nie, Zihao Chen, Yaqi Wang, Heng Chen, Weiqiang Huang, Yaobo Chen, Zhen-Hua Qian, Tian Lin, Junhao He, Junfeng Sun, Yu-Jie Chen, Zhuoyu Xue, Qi-Kun Superconductivity Ruddlesden-Popper bilayer nickelate thin film superconductors discovered under ambient pressure enable vast possibilities for investigating electronic structures of the superconducting state. Here, we report angle-resolved photoemission spectroscopy (ARPES) measurements of 1, 2, and 3 unit-cell epitaxial La2.85Pr0.15Ni2O7 films grown on SrLaAlO4 substates, through pure-oxygen in situ sample transportation. Evidence obtained using photons with distinct probing depths shows that conduction is localized primarily at the first unit cell near the interface. Scanning transmission electron microscopy (STEM), together with energy-dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), indicates that interfacial Sr diffusion and pronounced p-d hybridization gradient may collectively account for the interfacial confinement of conduction. Fermi surface maps reveal hole doping compared to non-superconducting ambient-pressure bulk crystals. Measurements of dispersive band structures suggest the contributions from both Ni dx2-y2 and dz2 orbitals at the Fermi level. Density functional theory (DFT) + U calculations capture qualitative features of the ARPES results, consistent with a hole-doped scenario. These findings constrain theoretical models of the superconducting mechanism and suggest potential for enhancing superconductivity in nickelates under ambient pressure. |
| title | Angle-resolved photoemission spectroscopy of superconducting (La,Pr)3Ni2O7/SrLaAlO4 heterostructures |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2501.09255 |