Critical fluctuation conductivity in layered superconductors in strong electric field

TL;DR

This paper calculates the fluctuation-induced conductivity in layered superconductors under strong electric fields, showing how high electric fields can suppress fluctuations near the critical temperature, with implications for high-temperature superconductor applications.

Contribution

It introduces a self-consistent Hartree approximation for paraconductivity under strong electric fields, extending previous Gaussian models and highlighting electric field effects on fluctuations.

Findings

Paraconductivity diverges less steeply near critical temperature in Hartree approximation.

High electric fields significantly suppress order-parameter fluctuations.

Results suggest electric fields can be used to control superconducting fluctuations.

Abstract

The paraconductivity, originating from critical superconducting order-parameter fluctuations in the vicinity of the critical temperature in a layered superconductor is calculated in the frame of the self-consistent Hartree approximation, for an arbitrarily strong electric field and zero magnetic field. The paraconductivity diverges less steep towards the critical temperature in the Hartree approximation than in the Gaussian one and it shows a distinctly enhanced variation with the electric field. Our results indicate that high electric fields can be effectively used to suppress order-parameter fluctuations in high-temperature superconductors.