Ambient-pressure superconductivity onset above 40 K in (La,Pr)3Ni2O7 films

IF 50.5 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Nature Pub Date : 2025-02-17 DOI:10.1038/s41586-025-08755-z
Guangdi Zhou, Wei Lv, Heng Wang, Zihao Nie, Yaqi Chen, Yueying Li, Haoliang Huang, Wei-Qiang Chen, Yu-Jie Sun, Qi-Kun Xue, Zhuoyu Chen
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Abstract

The discovery of Ruddlesden–Popper (RP) bilayer nickelate superconductors under high pressure has opened a new chapter in high-transition-temperature superconductivity1–8. However, the high-pressure conditions and presence of impurity phases have hindered comprehensive investigations into their superconducting properties and potential applications. Here we report ambient-pressure superconductivity onset above the McMillan limit (40 K) in RP bilayer nickelate epitaxial thin films. Three-unit-cell-thick La2.85Pr0.15Ni2O7 pure-phase single-crystal films are grown using the gigantic-oxidative atomic layer-by-layer epitaxy on SrLaAlO4 substrates9. Resistivity measurements and magnetic field responses indicate onset transition temperature of 45 K. The transition to zero resistance shows characteristics consistent with a Berezinskii–Kosterlitz–Thouless (BKT) behaviour, with TBKT = 9 K. The Meissner diamagnetic effect is observed at 8 K by using a mutual inductance setup, in agreement with the BKT-like transition. In- and out-of-plane critical magnetic fields show anisotropy. Scanning transmission electron microscopy images and X-ray reciprocal space mappings reveal that the RP bilayer nickelate films adopt a tetragonal phase under roughly 2% coherent epitaxial compressive strain in the NiO2 planes relative to the bulk. Our findings pave the way for comprehensive investigations of nickelate superconductors under ambient pressure conditions and for exploring superconductivity at higher transition temperatures through strain engineering in heterostructures. Ambient-pressure superconductivity onset above the McMillan limit in bilayer nickelate epitaxial thin films is reported, paving the way for comprehensive investigations of superconductors and for exploring superconductivity at higher transition temperatures in heterostructures.

Abstract Image

(La,Pr)3Ni2O7薄膜在40 K以上出现常压超导性
高压下双层镍酸盐超导体的发现揭开了高转变温度(high- tc)超导的新篇章。然而,高压条件和杂质相的存在阻碍了对其超导性能和潜在应用的全面研究。在这里,我们报道了双层镍酸盐外延薄膜在麦克米伦极限(40k)以上的大气压超导性。在SrLaAlO4衬底上采用巨大氧化原子逐层外延(goal - epitaxy)法制备了La2.85Pr0.15Ni2O7纯相单晶薄膜9。电阻率测量和磁场响应表明起始TC = 45 K。向零电阻的转变表现出与BKT (Berezinskii-Kosterlitz-Thouless)类行为一致的特征,TBKT = 9 K。在TM = 8 K时,通过互感装置观察到迈斯纳反磁效应,与bkt样转变一致。面内和面外临界磁场表现出各向异性。扫描透射电子显微镜(STEM)图像和x射线互易空间映射(RSMs)显示,在NiO2平面相对于块体的约2%相干外延压缩应变下,双层镍酸盐膜呈四方相。我们的发现为在环境压力条件下全面研究镍酸盐超导体以及通过异质结构中的应变工程探索更高转变温度下的超导性铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Nature
Nature 综合性期刊-综合性期刊
CiteScore
90.00
自引率
1.20%
发文量
3652
审稿时长
3 months
期刊介绍: Nature is a prestigious international journal that publishes peer-reviewed research in various scientific and technological fields. The selection of articles is based on criteria such as originality, importance, interdisciplinary relevance, timeliness, accessibility, elegance, and surprising conclusions. In addition to showcasing significant scientific advances, Nature delivers rapid, authoritative, insightful news, and interpretation of current and upcoming trends impacting science, scientists, and the broader public. The journal serves a dual purpose: firstly, to promptly share noteworthy scientific advances and foster discussions among scientists, and secondly, to ensure the swift dissemination of scientific results globally, emphasizing their significance for knowledge, culture, and daily life.
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