空穴载流子对加压黑磷超导性的重要作用
The vital role of hole-carriers for superconductivity in pressurized black phosphorus
摘要：
载流子类型对超导性的影响一直是理解常规和非常规超导体的重要问题[1-7]。对于超导的元素，已知空穴载流子控制过渡族和主族金属的超导性[8-10]。然而，由于缺乏实验数据，空穴载流子在通常不导电但可以转化为超导体的元素中的作用仍然不清楚。在这里，我们报告的第一个原位高压霍尔效应测量单晶黑磷，测量到~ 50 GPa，并找到霍尔系数和超导转变温度（TC）之间的相关性。我们的结果表明空穴载流子在发展超导电性和提高TC中起着至关重要的作用。重要的是，我们还发现了在高压立方相在~17.2GPa的Lifshitz转变，这揭示了一个令人困惑的山谷在超导TC压力相图的起源。这些结果提供了深入了解空穴载流子在压力下发展简单半导体固体超导性中的作用。
英文摘要：
The influence of carrier type on superconductivity has been an important issue for understanding both conventional and unconventional superconductors [1-7]. For elements that superconduct, it is known that hole-carriers govern the superconductivity for transition and main group metals [8-10]. The role of hole-carriers in elements that are not normally conducting but can be converted to superconductors, however, remains unclear due to the lack of experimental data. Here we report the first in-situ high pressure Hall effect measurements on single crystal black phosphorus, measured up to ~ 50 GPa, and find a correlation between the Hall coefficient and the superconducting transition temperature (TC). Our results reveal that hole-carriers play a vital role in developing superconductivity and enhancing TC. Importantly, we also find a Lifshitz transition in the high-pressure cubic phase at ~17.2GPa, which uncovers the origin of a puzzling valley in the superconducting TC-pressure phase diagram. These results offer insight into the role of hole-carriers in developing superconductivity in simple semiconducting solids under pressure.
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