Nodeless superconducting gap and electron-boson coupling in (La,Pr,Sm)$_{3}$Ni$_2$O$_7$ films
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915378691571712 |
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| author | Shen, Jianchang Zhou, Guangdi Miao, Yu Li, Peng Ou, Zhipeng Chen, Yaqi Wang, Zechao Luan, Runqing Sun, Hongxu Feng, Zikun Yong, Xinru Li, Yueying Xu, Lizhi Lv, Wei Nie, Zihao Wang, Heng Huang, Haoliang Sun, Yu-Jie Xue, Qi-Kun He, Junfeng Chen, Zhuoyu |
| author_facet | Shen, Jianchang Zhou, Guangdi Miao, Yu Li, Peng Ou, Zhipeng Chen, Yaqi Wang, Zechao Luan, Runqing Sun, Hongxu Feng, Zikun Yong, Xinru Li, Yueying Xu, Lizhi Lv, Wei Nie, Zihao Wang, Heng Huang, Haoliang Sun, Yu-Jie Xue, Qi-Kun He, Junfeng Chen, Zhuoyu |
| contents | The discovery of superconductivity in Ruddlesden-Popper (RP) bilayer nickelate films under ambient pressure provides an unprecedented opportunity to directly investigate electronic energy scales of the superconducting state and the pairing mechanism. Here, we report angle-resolved photoemission spectroscopy measurements of superconducting (La,Pr,Sm)$_{3}$Ni$_2$O$_7$ thin films epitaxially grown on SrLaAlO$_4$ substrates by developing an ultra-high vacuum low-temperature quenching and transfer technique. A finite superconducting gap of ~18 meV with pronounced coherence peak is observed along the Brillouin zone diagonal direction. Remarkably, the finite superconducting gap persists across the entire Brillouin zone of the underlying Fermi surfaces, revealing the absence of gap nodes. An abrupt band renormalization, manifested as a kink in the energy-momentum dispersion at ~70 meV below the Fermi level, indicates an electron-boson coupling in the system. The simultaneous observation of a nodeless superconducting gap and electron-boson coupling provides crucial insights into the pairing symmetry and gluing mechanism in high-T$_c$ RP bilayer nickelates. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_17831 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nodeless superconducting gap and electron-boson coupling in (La,Pr,Sm)$_{3}$Ni$_2$O$_7$ films Shen, Jianchang Zhou, Guangdi Miao, Yu Li, Peng Ou, Zhipeng Chen, Yaqi Wang, Zechao Luan, Runqing Sun, Hongxu Feng, Zikun Yong, Xinru Li, Yueying Xu, Lizhi Lv, Wei Nie, Zihao Wang, Heng Huang, Haoliang Sun, Yu-Jie Xue, Qi-Kun He, Junfeng Chen, Zhuoyu Superconductivity Strongly Correlated Electrons The discovery of superconductivity in Ruddlesden-Popper (RP) bilayer nickelate films under ambient pressure provides an unprecedented opportunity to directly investigate electronic energy scales of the superconducting state and the pairing mechanism. Here, we report angle-resolved photoemission spectroscopy measurements of superconducting (La,Pr,Sm)$_{3}$Ni$_2$O$_7$ thin films epitaxially grown on SrLaAlO$_4$ substrates by developing an ultra-high vacuum low-temperature quenching and transfer technique. A finite superconducting gap of ~18 meV with pronounced coherence peak is observed along the Brillouin zone diagonal direction. Remarkably, the finite superconducting gap persists across the entire Brillouin zone of the underlying Fermi surfaces, revealing the absence of gap nodes. An abrupt band renormalization, manifested as a kink in the energy-momentum dispersion at ~70 meV below the Fermi level, indicates an electron-boson coupling in the system. The simultaneous observation of a nodeless superconducting gap and electron-boson coupling provides crucial insights into the pairing symmetry and gluing mechanism in high-T$_c$ RP bilayer nickelates. |
| title | Nodeless superconducting gap and electron-boson coupling in (La,Pr,Sm)$_{3}$Ni$_2$O$_7$ films |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2502.17831 |