AI 中文总结
该研究探究了悬浮La0.8Sr0.2NiO2膜在210 GPa超高压下的超导电性，发现其超导转变温度呈圆顶状演化，且超导电性对超高压的稳健性为高Tc氧化物超导体中首次观测到。
AI 中文摘要
无限层镍酸盐薄膜中超导电性的发现，为探索铜氧化物家族之外的非常规氧化物超导体开辟了新领域。然而，衬底的存在阻碍了极高压力下的研究。近期一项对悬浮Nd0.85Sr0.15NiO2膜的研究解决了该问题，显示超导转变温度随压力升高至91 GPa持续上升，无饱和迹象。自然会让人好奇更高压力下的情况。本文报告，悬浮La0.8Sr0.2NiO2膜的超导电性在施加的高达210 GPa的超高压下仍能维持；超导转变起始温度呈连续的圆顶状演化，从环境压力下的16 K升至146 GPa时的峰值74.5 K，随后逐渐降至210 GPa时的57.4 K。这种超导电性对超高压的稳健性此前在高Tc氧化物超导体中未曾观测到。
英文摘要
The discovery of superconductivity in infinite-layer nickelate thin films has opened a new frontier for exploring unconventional oxide superconductors beyond the copper oxide family. However, the presence of substrate hampers investigations under very high pressure. Recently, this problem was circumvented by a study of freestanding Nd0.85Sr0.15NiO2 membranes, which revealed that superconducting transition temperature kept increasing as the pressure was ramped up to 91 GPa, without showing signs of saturation. Naturally, one wonders what would happen at even higher pressures. Here, we report that superconductivity in a freestanding La0.8Sr0.2NiO2 membrane persists under applied ultrahigh pressures up to 210 GPa. The superconducting transition onset temperature exhibits a continuous dome-like evolution, increasing from 16 K at ambient pressure to a peak of 74.5 K at 146 GPa, and then gradually decreasing to 57.4 K at 210 GPa. Such robustness of superconductivity against ultrahigh pressure has not been observed in high-Tc oxide superconductors before.
Comments18 pages and 5 figures
