AI 中文总结
研究在掌型立方砧压力室中实现软点接触安德烈夫反射光谱，结合两种技术可在高压下稳定形成点接触结，对Nb等材料测量，观察到零偏置电导峰并研究其相关特性，为非常规超导性提供证据，搭建实验平台开辟研究新途径。
AI 中文摘要
我们通过将衬底锚固策略与外部导线分裂技术相结合，在掌型立方砧压力室中实现了软点接触安德烈夫反射光谱（PCARS）。这种设计能在高达15 GPa的静水压力下稳定形成多个点接触结。对元素超导体Nb的基准测量显示出高再现性，并得到零温度超导能隙，能隙比为3.3。我们还将该技术应用于Kagome金属超导体CsCr3Sb5和双层镍酸盐超导体La2PrNi2O7。观察到明显的零偏置电导峰，并研究了它们随温度、磁场和外加压力的演变，以及超导能隙大小和可能的配对对称性。这些测量为这些材料中的非常规超导性提供了光谱证据。我们的工作建立了一个强大的实验平台，架起了宏观电输运和微观光谱探测之间的桥梁，为研究各种压力诱导的非常规超导体中的配对对称性开辟了新途径。
英文摘要
We have implemented soft point-contact Andreev reflection spectroscopy (PCARS) in a palm-type cubic anvil pressure cell by combining a substrate anchoring strategy with an external wire-splitting technique. This design enables the stable formation of multiple point contact junctions under hydrostatic pressures up to 15 GPa. Benchmark measurements on the elemental superconductor Nb demonstrate high reproducibility and yield a zero-temperature superconducting gap with a gap ratio of 3.3. We further apply this technique to the Kagome metal superconductor CsCr3Sb5 and the bilayer nickelate superconductor La2PrNi2O7. Pronounced zero-bias conductance peaks are observed, and their evolution with temperature, magnetic field and applied pressure is investigated, together with the superconducting gap magnitude and possible pairing symmetries. These measurements provide spectroscopic evidence consistent with unconventional superconductivity in these materials. Our work establishes a robust experimental platform that bridges macroscopic electrical transport and microscopic spectroscopic probes, opening a new avenue for investigating pairing symmetry in a wide range of pressure-induced unconventional superconductors.
Comments16 pages, 4 figures
