Vortex lattice melting and the damping of the dHvA oscillations in the mixed state

TL;DR

This paper investigates how phase fluctuations in the superconducting order parameter cause vortex lattice melting and significantly increase quasiparticle scattering, leading to damping of dHvA oscillations in the mixed state of a quasi-2D organic superconductor.

Contribution

It demonstrates that phase fluctuations account for the observed damping of dHvA oscillations and provides a quantitative explanation for the field dependence in the mixed state.

Findings

Phase fluctuations enhance quasiparticle scattering.

Vortex lattice melting affects dHvA oscillation amplitude.

Quantitative agreement with experimental data.

Abstract

Phase fluctuations in the superconducting order parameter, which are responsible for the melting of the Abrikosov vortex lattice below the mean field $H_{c2}$, are shown to dramatically enhance the scattering of quasi-particles by the fluctuating pair potential, thus leading to enhanced damping of the dHvA oscillations in the liquid mixed state. This effect is shown to quantitatively account for the detailed field dependence of the dHvA amplitude observed recently in the mixed state of a Quasi 2D organic SC.