Oveshnikov Leonid N, Davydov Alexander B, Suslov Alexey V, Ril' Alexey I, Marenkin Sergey F, Vasiliev Alexander L, Aronzon Boris A
National Research Center "Kurchatov Institute", Moscow, 123182, Russia.
P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia.
Sci Rep. 2020 Mar 12;10(1):4601. doi: 10.1038/s41598-020-61376-6.
In this study we observed the reproducible superconducting state in CdAs thin films without any external stimuli. Comparison with our previous results reveals similar qualitative behavior for films synthesized by different methods, while the difference in the values of the critical parameters clearly shows the possibility to control this state. The X-ray diffraction measurements demonstrate the presence of the tetragonal CdAs crystal phase in studied films. Measurements of high-field magnetoresistance reveal pronounced Shubnikov - de Haas oscillations. The analysis of these oscillations suggests that, due to high carrier concentration in studied CdAs films, the initial Dirac semimetal phase may be partially suppressed, which, however, does not contradict with possible topological nature of the observed superconductivity.
在本研究中，我们在没有任何外部刺激的情况下观察到了CdAs薄膜中可重现的超导态。与我们之前的结果相比，不同方法合成的薄膜呈现出相似的定性行为，而临界参数值的差异清楚地表明了控制这种状态的可能性。X射线衍射测量表明，所研究的薄膜中存在四方CdAs晶相。高场磁阻测量揭示了明显的舒布尼科夫-德哈斯振荡。对这些振荡的分析表明，由于所研究的CdAs薄膜中载流子浓度较高，初始狄拉克半金属相可能会被部分抑制，然而，这与所观察到的超导性可能的拓扑性质并不矛盾。
