Physics – Condensed Matter – Superconductivity
Scientific paper
2010-07-03
Physical Review B 82, 184528+ (2010)
Physics
Condensed Matter
Superconductivity
13 pages, 9 images
Scientific paper
10.1103/PhysRevB.82.184528
Resonances in the superconducting properties, in a regime of crossover from BCS to mixed Bose-Fermi superconductivity, are investigated in a two-band superconductor where the chemical potential is tuned near the band edge of the second mini-band generated by quantum confinement effects. The shape resonances at T=0 in the superconducting gaps (belonging to the class of Feshbach-like resonances) is manifested by interference effects in the superconducting gap at the first large Fermi surface when the chemical potential is in the proximity of the band edge of the second mini-band. The case of a superlattice of quantum wells is considered and the amplification of the superperconducting gaps at the 3D-2D Fermi surface topological transition is clearly shown. The results are found to be in good agreement with available experimental data on a superlattice of honeycomb boron layers intercalated by Al and Mg spacer layers.
Bianconi Antonio
Caprara Sergio
Innocenti Davide
Perali Andrea
Poccia Nicola
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