Atomically resolved intrinsic superconducting gap in (La,Pr)3Ni2O7 films
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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_ | 1866911685706514432 |
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| author | Wang, Xinxin Chen, Yaqi Ding, Cui Xu, Lizhi Miao, Jian-Jian Zhou, Guangdi Chen, Zhuoyu Sun, Yu-Jie Jia, Jin-Feng Xue, Qi-Kun |
| author_facet | Wang, Xinxin Chen, Yaqi Ding, Cui Xu, Lizhi Miao, Jian-Jian Zhou, Guangdi Chen, Zhuoyu Sun, Yu-Jie Jia, Jin-Feng Xue, Qi-Kun |
| contents | Ruddlesden-Popper bilayer nickelates provide an emerging platform for studying high-temperature superconductivity, yet the superconducting pairing symmetry remains under debate. Here, we use atomic-resolution scanning tunnelling microscopy and spectroscopy to investigate superconducting 1.5-unit-cell (La,Pr)3Ni2O7 films grown on SrLaAlO4. A cryogenic ultrahigh-vacuum (UHV) sample transfer preserves an ordered sqrt(2) * sqrt(2) surface and yields reproducible U-shaped spectra with two gap scales of ~14 and ~20 meV and extended flat zero-conductance bottoms. By contrast, samples exposed for a longer time in UHV without cooling during transfer show V-shaped spectra despite retaining the surface reconstruction and a transport superconducting transition onset above 40 K. Wide-energy-range spectra indicate that oxygen loss can mix density-wave-related spectral weight. Our measurements provide an atomic-scale observation of the intrinsic nodeless superconducting gap in bilayer nickelate ultrathin films. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_14806 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Atomically resolved intrinsic superconducting gap in (La,Pr)3Ni2O7 films Wang, Xinxin Chen, Yaqi Ding, Cui Xu, Lizhi Miao, Jian-Jian Zhou, Guangdi Chen, Zhuoyu Sun, Yu-Jie Jia, Jin-Feng Xue, Qi-Kun Superconductivity Materials Science Ruddlesden-Popper bilayer nickelates provide an emerging platform for studying high-temperature superconductivity, yet the superconducting pairing symmetry remains under debate. Here, we use atomic-resolution scanning tunnelling microscopy and spectroscopy to investigate superconducting 1.5-unit-cell (La,Pr)3Ni2O7 films grown on SrLaAlO4. A cryogenic ultrahigh-vacuum (UHV) sample transfer preserves an ordered sqrt(2) * sqrt(2) surface and yields reproducible U-shaped spectra with two gap scales of ~14 and ~20 meV and extended flat zero-conductance bottoms. By contrast, samples exposed for a longer time in UHV without cooling during transfer show V-shaped spectra despite retaining the surface reconstruction and a transport superconducting transition onset above 40 K. Wide-energy-range spectra indicate that oxygen loss can mix density-wave-related spectral weight. Our measurements provide an atomic-scale observation of the intrinsic nodeless superconducting gap in bilayer nickelate ultrathin films. |
| title | Atomically resolved intrinsic superconducting gap in (La,Pr)3Ni2O7 films |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2605.14806 |