On the superconducting nature of the Bi-II phase of elemental Bismuth

Abstract

The superconductivity in the Bi-II phase of elemental Bismuth (transition temperature $T_{\mathrm{c}}\simeq 3.92$ 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 $B_{\mathrm{c}}(0)\simeq 31.97$~mT. The Eliashberg theory approach provides a good agreement with the experimental $T_{\mathrm{c}}$ and the temperature evolution of $B_{\mathrm{c}}$. The estimated value for the retardation (coupling) parameter $k_{\mathrm{B}}{T}_{\mathrm{c}}/{\omega }_{\ln }\approx 0.07$ (${\omega }_{\ln }$ is the logarithmically averaged phonon frequency) suggests that Bi-II is an intermediately-coupled superconductor.

6 pages, 2 figures

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