论文标题
k $ _3 $ c $ _ {60} $的全套超导参数
Full Set of Superconducting Parameters of K$_3$C$_{60}$
论文作者
论文摘要
超导参数是构建或识别负责超导性机理的理论的关键。尽管在过去30年中做出了巨大的努力，但富勒里德超导体的这种参数尚未得到很好的确定。在这里，我们通过对特征良好的k $ _ {3} $ c $ _ {60} $样本进行系统研究提供了一套全套参数。从直接电气传输测量值以及相对较高的临界温度和较大的临界电流密度与k $ _ {3} $ c $ _ {60} $分类为相对较高的临界温度和大临界电流密度，从直接电气传输测量中获得的33.0 $ \ pm $ 0.5 t获得的高临界场$ _ {60} $从直接电气传输测量中分类为33.0 $ \ pm $ 0.5 t，这是获得33.0 $ \ pm $ 0.5 t的这个高临界场以及大还原的超导能量隙和强烈的声子自我能量效应支持该超导体中强的电子偶联相互作用。对所有自愿获得的参数的评估表明，k $ _3 $ c $ _ {60} $的超导性的非常规性，具有强大的电子 - phonon耦合和电子相关的共同贡献。这些结果和发现不仅对于从根本上了解富勒利德的超导性，而且对于将来的超导磁铁开发和应用都很重要。
The superconducting parameters are the key for building or identifying the theory responsible for the mechanism of superconductivity. Such parameters for fulleride superconductors have not been well established despite the tremendous efforts over the past 30 years. Here we provide a full set of parameters through a systematic study on a well-characterized K$_{3}$C$_{60}$ sample. The obtained high upper critical field of 33.0$\pm$0.5 T from the direct electrical transport measurements together with the relatively high critical temperature and large critical current density classifies K$_{3}$C$_{60}$ as a promising three-dimensional superconducting magnet material with the advantage of the rich carbon abundance on the Earth. This high upper critical field along with the large reduced superconducting energy gap and strong phonon self-energy effect supports the strong electron-phonon coupling interactions in this superconductor. The evaluation of all self-consistently obtained parameters suggests the unconventional nature of the superconductivity for K$_3$C$_{60}$ with the joint contributions from the strong electron-phonon coupling and electron correlations. These results and findings are important not only for fundamentally understanding the superconductivity in fullerides but also for future superconducting magnet developments and applications.
