On the superconducting nature of the Bi-II phase of elemental Bismuth
- Resource Type
- Working Paper
- Authors
- Khasanov, Rustem; Radonjić, Miloš M.; Luetkens, Hubertus; Morenzoni, Elvezio; Simutis, Gediminas; Schönecker, Stephan; Appelt, Wilhelm H.; Östlin, Andreas; Chioncel, Liviu; Amato, Alex
- Source
- Phys. Rev. B 99, 174506 (2019)
- Subject
- Condensed Matter - Superconductivity
- Language
The superconductivity in the Bi-II phase of elemental Bismuth (transition temperature $T_{\rm c}\simeq3.92$ K at pressure $p\simeq 2.80$ GPa) was studied experimentally by means of the muon-spin rotation as well as theoretically by using the Eliashberg theory in combination with Density Functional Theory calculations. Experiments reveal that Bi-II is a type-I superconductor with a zero temperature value of the thermodynamic critical field $B_{\rm c}(0)\simeq31.97$~mT. The Eliashberg theory approach provides a good agreement with the experimental $T_{\rm c}$ and the temperature evolution of $B_{\rm c}$. The estimated value for the retardation (coupling) parameter $k_{\rm B}T_{\rm c}/\omega_{\rm ln} \approx 0.07$ ($\omega_{\rm ln}$ is the logarithmically averaged phonon frequency) suggests that Bi-II is an intermediately-coupled superconductor.
Comment: 6 pages, 2 figures