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.
@article{arxiv.cond-mat/9501109,
title = {de Haas-van Alphen Oscillations in a Superconducting State at High Magnetic Fields},
author = {S. Dukan and Z. Tesanovic},
journal= {arXiv preprint arXiv:cond-mat/9501109},
year = {2016}
}
Comments
11 pages+ 1 figure available on request from [email protected], to appear in Phys. Rev. Lett.