Supercurrent transferring through c-axis cuprate Josephson junctions with thick normal-metal-bridge

TL;DR

This paper presents an exactly solvable model showing that supercurrent in c-axis cuprate SNS junctions decays slowly with normal metal thickness, explaining the giant proximity effect observed experimentally.

Contribution

It introduces a simple, exactly solvable model demonstrating supercurrent persistence over thicker normal metals than expected, accounting for experimental observations.

Findings

Supercurrent decreases slower than exponential decay with thickness.

The model explains the giant proximity effect in cuprate SNS junctions.

Supercurrent persists through thicker normal metals than traditional models predict.

Abstract

With simple but exactly solvable model, we investigate the supercurrent transferring through the c-axis cuprate superconductor-normal metal-superconductor junctions with the clean normal metal much thicker than its coherence length. It is shown that the supercurrent as a function of thickness of the normal metal decreases much slower than the exponential decaying expected by the proximity effect. The present result may account for the giant proximity effect observed in the c-axis cuprate SNS junctions.