de Haas-van Alphen Oscillations in a Superconducting State at High Magnetic Fields

Abstract

Low-temperature quantum oscillations of the dHvA amplitude are shown to persist far below the upper critical field of a strongly type-II superconductor, due to the gapless nature of the BCS quasiparticle spectrum in high fields. The dHvA amplitude in the superconducting state is smaller than its normal state countpart by factor ~[max(T,Gamma]/delta]**2, where Gamma is the damping. This factor reflects the presence of a small gapless portion of the fermi surface, surrounded by regions where the BCS gap is large. The agreement with recent experimental data on V3Si is very good.

11 pages+ 1 figure available on request from [email protected], to appear in Phys. Rev. Lett.

References in corpus (3)

• Magnetic Oscillations and Quasiparticle Band Structure in the Mixed State of Type-II Superconductors
• Superconductivity in High Magnetic Field:Excitation Spectrum and Tunneling Properties
• Quantum Mechanics and Superconductivity in a Magnetic Field

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