Superconductivity in Freestanding Infinite‐Layer Nickelate Membranes
Shengjun Yan, Wei Mao, Wenjie Sun, Yueying Li, Haoying Sun, Jiangfeng Yang, Bo Hao, Wei Guo, Leyan Nian, Zhengbin Gu, Peng Wang, Yuefeng Nie
Abstract
Abstract The observation of superconductivity in infinite‐layer nickelates has attracted significant attention due to its potential as a new platform for exploring high‐ T c superconductivity. However, thus far, superconductivity has only been observed in epitaxial thin films, which limits the manipulation capabilities and modulation methods compared to two‐dimensional exfoliated materials. Given the exceptionally giant strain tunability and stacking capability of freestanding membranes, separating superconducting nickelates from the as‐grown substrate is a novel way to engineer the superconductivity and uncover the underlying physics. Herein, this work reports the synthesis of the superconducting freestanding La 0.8 Sr 0.2 NiO 2 membranes (), emphasizing the crucial roles of the interface engineering in the precursor phase film growth and the quick transfer process in achieving superconductivity. This work offers a new versatile platform for investigating superconductivity in nickelates, such as the pairing symmetry via constructing Josephson tunneling junctions and higher T c values via high‐pressure experiments.