Dynamical Induction of s-wave Component in d-wave Superconductor Driven by Thermal Fluctuations

TL;DR

This paper explores how thermal fluctuations induce a s-wave component in a d-wave superconductor, affecting conductivity properties near the critical temperature, using a two-component stochastic TDGL model.

Contribution

It introduces a model for mutual induction effects between d-wave and s-wave order parameters due to thermal fluctuations, analyzing their impact on conductivity.

Findings

Coupling increases paraconductivity.

Coupling decreases excess Hall conductivity.

Singular behavior observed in conductivity dependence on coupling.

Abstract

We investigated the mutual induction effects between the d-wave and the s-wave components of order parameters due to superconducting fluctuation above the critical temperatures and calculated its contributions to paraconductivity and excess Hall conductivity based on the two-component stochastic TDGL equation. It is shown that the coupling of two components increases paraconductivity while it decreases excess Hall conductivity compared to the cases when each component fluctuates independently. We also found the singular behavior in the paraconductivity and the excess Hall conductivity dependence on the coupling parameter which is consistent with the natural restriction among the coefficients of gradient terms.