Magnetoenhancement of superconductivity in composite D-wave superconductors

TL;DR

This paper investigates how a small magnetic field can enhance superconductivity in composite D-wave superconductors with randomly oriented droplets, revealing a non-traditional magnetic response.

Contribution

It introduces the concept of magnetic field-induced enhancement of superconductivity in composite D-wave materials, a novel phenomenon not observed in conventional superconductors.

Findings

Small magnetic fields can increase superfluid density.

Critical temperature can be enhanced by weak magnetic fields.

Larger magnetic fields suppress superconductivity as expected.

Abstract

We study composite D-wave superconductors consisting of randomly oriented and randomly distributed superconducting droplets embedded into a matrix. In a certain range of parameters the application of a small magnetic field enhances the superconductivity in these materials while larger fields suppress superconductivity as usual in conventional superconductors. We investigate the magnetic field dependence of the superfluid density and the critical temperature of such superconductors.