Two-Fluid Model for Granular Superconductors

TL;DR

This paper introduces a two-fluid model for granular superconductors that accurately predicts transport properties across different materials, independent of composition or doping type.

Contribution

It develops a novel statistical two-fluid model combining resistively shunted junction and two-level system theories for granular superconductors.

Findings

Excellent agreement with experimental transport data

Model applies across various high-Tc superconductors

Independent of sample composition and doping type

Abstract

A two-fluid model is proposed to describe the transport properties of granular superconductors. Using the resistively shunted junction model and some aspects of the two-level system theory, a statistical model is developed which takes into account the ratio between the number of normal and superconducting electrons carrying the applied current. The theoretical model reveals excellent agreement when compared to transport properties of four high-Tc superconductors. The results suggest that the two-fluid model is independent of the sample composition, critical temperature and whether the superconducting compound is electron or hole-doped.