Comment on the de Haas-van Alphen Effect in the Superconducting Mixed State of 2H–NbSe_<b>2</b>

Abstract

We present the de Haas-van Alphen (dHvA) effect in the superconducting mixed state of 2H–NbSe 2 . Our data are consistent with the dHvA results obtained by Graebner and Robbins, which have been the subject of controversy from the viewpoint of experiment and theory. We discuss the reason why the theoretically expected cylindrical Fermi surfaces are not detected in the dHvA experiment and also the mechanism of the dHvA effect in the mixed state.