Incoherence and enhanced magnetic quantum oscillations in the mixed state of a layered organic superconductor

TL;DR

This paper proposes a theory explaining enhanced magnetic quantum oscillations in the superconducting state of layered metals, highlighting how incoherent interlayer transport can increase oscillation amplitudes contrary to typical expectations.

Contribution

It introduces a novel mechanism where incoherent interlayer transport modifies the layer-stacking factor, leading to increased quantum oscillation amplitudes in the mixed state.

Findings

Incoherence deforms the layer-stacking factor into a complex form.

The mechanism can offset the usual damping of oscillations below the upper critical field.

Enhanced oscillations are explained by decreased effective scattering in the mixed state.

Abstract

We present a theory which is able to explain enhanced magnetic quantum-oscillation amplitudes in the superconducting state of a layered metal with incoherent electronic transport across the layers. The incoherence acts through the deformation of the layer-stacking factor which becomes complex and decreases the total scattering rate in the mixed state. This novel mechanism can compensate the usual decrease of the Dingle factor below the upper critical magnetic field caused by the intralayer scattering.