Experimental Progress in Ambient-Pressure Superconducting Bilayer Nickelate Films
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866911673071173632 |
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| author | Zhang, Meng Yan, Xi |
| author_facet | Zhang, Meng Yan, Xi |
| contents | Bilayer Ruddlesden-Popper nickelates display superconductivity near 80 K under high pressure, establishing a new nickelate platform for studying unconventional high-temperature superconductivity. The recent stabilization of superconducting RA3Ni2O7 (RA = rare earth or alkaline earth) films at ambient pressure has changed the experimental landscape: epitaxial strain can reproduce key structural ingredients of the high-pressure phase while making transport, spectroscopy, microscopy, and device-oriented measurements directly accessible. This Review summarizes the experimental progress on ambient-pressure superconducting bilayer nickelate films, with emphasis on synthesis routes, oxygen stoichiometry, substrate-induced strain, normal-state transport, superconducting properties, doping phase diagrams, and momentum-resolved electronic structure. We highlight several issues that remain unsettled, including the reproducibility of phase-pure ultrathin films, the microscopic origin of the two-step superconducting transition, the role of oxygen defects and substrate-derived doping, the position of the Ni 3dz2-derived γ band, and the pairing symmetry. We close by outlining experimental directions that could establish a more quantitative link among crystal structure, orbital reconstruction, and superconductivity in bilayer nickelate films. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_11584 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Experimental Progress in Ambient-Pressure Superconducting Bilayer Nickelate Films Zhang, Meng Yan, Xi Superconductivity Strongly Correlated Electrons Bilayer Ruddlesden-Popper nickelates display superconductivity near 80 K under high pressure, establishing a new nickelate platform for studying unconventional high-temperature superconductivity. The recent stabilization of superconducting RA3Ni2O7 (RA = rare earth or alkaline earth) films at ambient pressure has changed the experimental landscape: epitaxial strain can reproduce key structural ingredients of the high-pressure phase while making transport, spectroscopy, microscopy, and device-oriented measurements directly accessible. This Review summarizes the experimental progress on ambient-pressure superconducting bilayer nickelate films, with emphasis on synthesis routes, oxygen stoichiometry, substrate-induced strain, normal-state transport, superconducting properties, doping phase diagrams, and momentum-resolved electronic structure. We highlight several issues that remain unsettled, including the reproducibility of phase-pure ultrathin films, the microscopic origin of the two-step superconducting transition, the role of oxygen defects and substrate-derived doping, the position of the Ni 3dz2-derived γ band, and the pairing symmetry. We close by outlining experimental directions that could establish a more quantitative link among crystal structure, orbital reconstruction, and superconductivity in bilayer nickelate films. |
| title | Experimental Progress in Ambient-Pressure Superconducting Bilayer Nickelate Films |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.11584 |