Superconductivity onset above 60 K in ambient-pressure nickelate films

作者：Guangdi Zhou, Heng Wang, Haoliang Huang, Yaqi Chen, Fei Peng, Wei Lv, Zihao Nie, Wei Wang, Jin-Feng Jia, Qi-Kun Xue, Zhuoyu Chen · 发表于：National Science Review · 年份：2026 · DOI：10.1093/nsr/nwag151 · 被引用次数：9 · 研究领域：Magnetic and transport properties of perovskites and related materials、Physics of Superconductivity and Magnetism、Electronic and Structural Properties of Oxides

ABSTRACT Ambient-pressure superconductivity in nickelates has been capped at an onset transition temperature (Tconset) of ∼50 K, a value that remains lower than those of the cuprate (∼133 K) and iron-based (∼55 K) counterparts, despite the promise shown under high pressure. Here, we report ambient-pressure superconductivity onset at ∼63 K in epitaxial (La,Pr)3Ni2O7 thin films grown under compressive strain on SrLaAlO4 substrates. This Tc leap is enabled by pushing our gigantic-oxidative atomic-layer-by-layer epitaxy (GAE) method into an extreme non-equilibrium growth regime. It simultaneously enhances kinetics via higher temperatures and achieves full oxygenation in situ without post-annealing. Synchrotron X-ray diffraction and scanning transmission electron microscopy confirm that this approach yields films of large-scale crystalline purity, overcoming the inherent metastability of the strained superconducting phase. Transport measurements reveal a zero-resistance temperature (Tczero) reaching ∼37 K, while mutual inductance measurements demonstrate a robust diamagnetic transition starting at ∼23 K. These films exhibit a systematic evolution in their normal-state resistivity–temperature curve: the power-law exponent α evolves from Fermi-liquid-like (α ∼ 2) at lower Tconset to strange-metal-like (α ∼ 1) in higher Tconset samples, directly linking the enhanced superconductivity to non-Fermi liquid behavior. Mapping the vortex melting phase diagram by the mutual inductance techn...