Magnetoconductivity of low-dimensional disordered conductors at the onset of the superconducting transition

TL;DR

This paper investigates the magnetoconductivity of disordered low-dimensional superconductors near the transition, revealing fluctuation saturation at moderate fields and emphasizing the persistent role of interaction corrections like the Maki-Thompson term.

Contribution

It provides a comprehensive analysis considering strong magnetic fields and various temperatures, resolving previous discrepancies and highlighting the importance of interaction effects near the transition.

Findings

Magnetoconductivity saturates at moderate magnetic fields in 2D and 3D superconductors.

Weaker magnetic fields induce saturation closer to the critical temperature.

Interaction corrections, especially Maki-Thompson, remain significant away from the critical region.

Abstract

Magnetoconductivity of the disordered two- and three-dimensional superconductors is addressed at the onset of superconducting transition. In this regime transport is dominated by the fluctuation effects and we account for the interaction corrections coming from the Cooper channel. In contrast to many previous studies we consider strong magnetic fields and various temperature regimes, which allow to resolve the existing discrepancies with the experiments. Specifically, we find saturation of the fluctuations induced magneto-conductivity for both two- and three-dimensional superconductors at already moderate magnetic fields and discuss possible dimensional crossover at the immediate vicinity of the critical temperature. The surprising observation is that closer to the transition temperature weaker magnetic field provides the saturation. It is remarkable also that interaction correction to magnetoconductivity coming from the Cooper channel, and specifically the so called Maki-Thompson contribution, remains to be important even away from the critical region.