Theory of the de Haas-van Alphen effect in two-dimensional superconductors

摘要

The experimentally observed damping of magnetic oscillations in superconductors below B-c2 is qualitatively explained by application of the Lifshitz-Kosevich formula with the superconducting gap playing the role of the self-energy. In two dimensions this formula omits a leading order term proportional to oscillations of the self-energy. We apply a recently proposed formalism to derive the magnetization oscillation amplitude of two-dimensional superconductors in the (mixed) superconducting state. We find a significant correction to the LK formula, which leads to a sign reversal of the oscillations below B-c2. [References: 25]