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Resonant and crossover phenomena in a multiband superconductor: Tuning the chemical potential near a band edge (Articolo in rivista)

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Resonant and crossover phenomena in a multiband superconductor: Tuning the chemical potential near a band edge (Articolo in rivista) (literal)

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Alternative label

Innocenti D.; Poccia N.; Ricci A.; Valletta A.; Caprara S.; Perali A.; Bianconi A.; (2010)
Resonant and crossover phenomena in a multiband superconductor: Tuning the chemical potential near a band edge
in Physical review. B, Condensed matter and materials physics; The American Physical Society, College Park, MD 20740-3844 (Stati Uniti d'America)
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Innocenti D.; Poccia N.; Ricci A.; Valletta A.; Caprara S.; Perali A.; Bianconi A.; (literal)

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Physics Department, Sapienza University of Rome, Piazzale Aldo Moro 2, 00185 Rome, Italy Institute for Microelectronics and Microsystems, IMM CNR, Via del Fosso del Cavaliere 100, 00133 Roma, Italy School of Pharmacy, Physics Unit, University of Camerino, 62032 Camerino, Italy (literal)

Titolo

Resonant and crossover phenomena in a multiband superconductor: Tuning the chemical potential near a band edge (literal)

Abstract

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 miniband 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 miniband. The case of a superlattice of quantum wells is considered and the amplification of the superconducting gaps at the Lifshitz transition of the type neck-collapsing of Fermi surface topology 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 (literal)

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