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09 May 2024 |
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Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2 | | D. L. Bashlakov
; O. E. Kvitnitskaya
; G. Shipunov
; S. Aswartham
; O. D. Feya
; D. V. Efremov
; B. Büchner
; Yu. G. Naidyuk
; | | Date: |
13 May 2022 | | Abstract: | 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. | | Source: | arXiv, 2205.06610 | | Services: | Forum | Review | PDF | Favorites | |
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