Vortex Dynamics in Percolative Superconductors Containing Fractal Clusters of a Normal Phase

TL;DR

This paper investigates how fractal clusters in percolative superconductors influence magnetic and transport properties, revealing that fractality enhances vortex pinning and improves current-carrying capacity.

Contribution

It introduces the impact of fractal cluster boundaries on vortex dynamics and superconductor performance, providing new insights into their role in enhancing superconducting properties.

Findings

Fractal features are present in normal phase clusters.

Fractality of cluster boundaries intensifies vortex pinning.

Enhanced pinning improves superconductor current capacity.

Abstract

The effect of fractal clusters on magnetic and transport properties of percolative superconductors is studied. The superconductor contains percolative superconducting cluster carrying a transport current and clusters of a normal phase. It is found that normal phase clusters have essential fractal features. The fractal dimension of the boundary of normal phase clusters is estimated. The current-voltage characteristics of superconductors containing fractal clusters are obtained. It is found that the fractality of the cluster boundary intensifies pinning. This feature permits to enhance the current-carrying capability of the superconductors.