38 research outputs found
Superconductivity of Bi-III phase of elemental Bismuth: insights from Muon-Spin Rotation and Density Functional Theory
Using muon-spin rotation the pressure-induced superconductivity in the Bi-III
phase of elemental Bismuth (transition temperature K) was
investigated. The Ginzburg-Landau parameter
( is the magnetic penetration depth, is the coherence length)
was estimated which is the highest among single element superconductors. The
temperature dependence of the superconducting energy gap []
reconstructed from deviates from the weak-coupled BCS
prediction. The coupling strength was
estimated thus implying that Bi-III stays within the strong coupling regime.
The Density Functional Theory calculations suggest that superconductivity in
Bi-III could be described within the Eliashberg approach with the
characteristic phonon frequency meV. An alternative
pairing mechanism to the electron-phonon coupling involves the possibility of
Cooper pairing induced by the Fermi surface nesting.Comment: 5 pages, 4 figure
On the superconducting nature of the Bi-II phase of elemental Bismuth
The superconductivity in the Bi-II phase of elemental Bismuth (transition
temperature K at pressure 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 ~mT. The Eliashberg theory approach provides a good agreement
with the experimental and the temperature evolution of .
The estimated value for the retardation (coupling) parameter ( is the logarithmically
averaged phonon frequency) suggests that Bi-II is an intermediately-coupled
superconductor.Comment: 6 pages, 2 figure