Hole-doped superconductivity above 100 K in infinite-layer cuprate thin films
Abstract
Since the discovery of superconductivity in (La,Ba)2CuO2 (Ref.~bednorz1986possible), a broad family of structurally distinct cuprate superconductors has been proposed or engineered to elucidate the physics of high-temperature superconductivity~chu2015hole,plakida2010high. Among them, the infinite-layer cuprate has the simplest structure, consisting only of the essential ingredients for superconductivity: CuO2 square planes separated by spacer ions~siegrist1988parent. Despite being proposed nearly 40 years ago, the hole-doped superconductivity via chemical substitution in this compound has not yet been achieved, a fundamental open question in the field. Here, we report the observation of superconductivity in the hole-doped infinite-layer cuprate thin film. Measurements of resistivity and magnetic-field response in Sr1-xRbxCuO2 single-crystal thin films show superconducting transitions with a high onset temperature of 100 K. Hole doping is achieved via the synergistic effect of rubidium substitution and apical oxygen incorporation, as evidenced by structural analysis and transport measurements. As the parent structure of the cuprate family~chu2015hole, hole-doped infinite-layer cuprate provides a unique platform for revisiting key puzzles in cuprate superconductors~keimer2015quantum,tsuei2000pairing,armitage2010progress,dagotto1994correlated, including strange metal~proust2019remarkable,taillefer2010scattering and electron-hole symmetry~tohyama2004asymmetry,segawa2010zero,lee2014asymmetry, while bridging to cuprate-nickelate symmetry~li2019superconductivity,zeng2022superconductivity,chow2025bulk,lechermann2020late.
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