Bulk superconductivity near 40 K in hole-doped SmNiO2 at ambient pressure

• 成果类型: Article
• 署名作者: Chow, S. Lin Er; Luo, Zhaoyang; Ariando, A.
• 署名单位: National University of Singapore
• 刊物名称: Nature
• ISSN/ISSBN: 0028-1175
• DOI: 10.1038/s41586-025-08893-4
• 发表日期: 2025-06-05
• 关键词: high-temperature superconductivity; perovskite; physics; copper

摘要

The discovery of superconductivity in the Ba-La-Cu-O system (the cuprate) in the 30 K range marked a significant breakthrough, which inspired extensive exploration of oxide-based, layered superconductors to identify electron pairing with higher critical temperatures (Tc)1. Despite recent observations of superconductivity in nickel oxide-based compounds (the nickelates), evidence of Cooper pairing above 30 K in a system that is isostructural to the cuprates, but without copper, at ambient pressure and without lattice compression has remained elusive2, 3, 4-5. Here we report superconductivity with a Tc approaching 40 K under ambient pressure in d9-x hole-doped, late rare earth, infinite-layer nickel oxide (Sm-Eu-Ca-Sr)NiO2 thin films with negligible lattice compression, supported by observations of a zero-resistance state at 31 K and the Meissner effect. The material can be synthesized with essentially no Ruddlesden-Popper-type structural defects, exhibiting ultralow resistivity of approximately 0.01 m Omega cm, and with a residual resistivity ratio of up to 10. Our findings demonstrate the potential for achieving high-temperature superconductivity using strongly correlated d-electron metal oxides beyond copper as the building blocks for superconductivity, and offering a promising platform for further exploration and understanding of high-temperature Cooper pairing.