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PtBi2 is a Weyl semimetal, which demonstrates superconductivity with lowcritical temperature Tc ~ 0.6 K in the bulk. Here, we report our study ofelectron-phonon interaction (EPI) in trigonal PtBi2 by the Yanson point contact(PC) spectroscopy and presenting the observation of PC enhancedsuperconductivity. We show, that the Yansons PC spectra display a broad maximumaround 15 meV, indicating, apparently, EPI mechanism of Cooper pairing inPtBi2. Moreover, we discovered a substantial increase of Tc up to ~ 3.5 K inPCs. The observed Tc is sufficiently higher than the bulk value, as well asdetected at hydrostatic pressure. We calculated the phonon density of statesand Eliashberg EPI function in PtBi2 within the framework of the densityfunctional theory. A comparison of experimental data with theoreticalcalculations showed acceptable agreement. The theoretical Tc is 3.5 K, whichcorresponds to the experimental value.

Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2