论文标题
电子 - 光子相互作用和点接触增强的三角ptbi2中的超导性
Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2
论文作者
论文摘要
PTBI2是一个Weyl半学，表现出较低的临界温度TC 〜0.6 K的超导性。在这里，我们报告了通过Yanson Point接触（PC）光谱法（PC）光谱学中对三角PTBI2中电子相互作用（EPI）的研究，并介绍了PC的观察到增强的超导性。我们表明，Yanson PC光谱在15 MeV左右显示出广泛的最大值，这显然表明PTBI2中库珀配对的EPI机制。此外，我们发现PC中的TC大幅增加到〜3.5 K。观察到的TC足够高于大容量值，并且在静水压力下检测到。我们计算了密度功能理论框架内PTBI2中状态和EliAshberg EPI功能的声子密度。实验数据与理论计算的比较表明一致。理论TC为3.5 K，对应于实验值。
PtBi2 is a Weyl semimetal, which demonstrates superconductivity with low critical temperature Tc ~ 0.6 K in the bulk. Here, we report our study of electron-phonon interaction (EPI) in trigonal PtBi2 by the Yanson point contact (PC) spectroscopy and presenting the observation of PC enhanced superconductivity. We show, that the Yansons PC spectra display a broad maximum around 15 meV, indicating, apparently, EPI mechanism of Cooper pairing in PtBi2. Moreover, we discovered a substantial increase of Tc up to ~ 3.5 K in PCs. The observed Tc is sufficiently higher than the bulk value, as well as detected at hydrostatic pressure. We calculated the phonon density of states and Eliashberg EPI function in PtBi2 within the framework of the density functional theory. A comparison of experimental data with theoretical calculations showed acceptable agreement. The theoretical Tc is 3.5 K, which corresponds to the experimental value.
