Fabrication of Bi2212 Cross Whiskers Junction

TL;DR

This paper reports a novel method to fabricate intrinsic Josephson junctions by crossing Bi2212 whiskers and joining them through post-annealing, enabling electrical characterization without micro-fabrication.

Contribution

It introduces a micro-fabrication-free technique to create Bi2212 Josephson junctions using crossed whiskers and post-annealing, simplifying the process.

Findings

Superconducting transition around 80K observed.

Voltage jump consistent with intrinsic Josephson effect.

Metallic behavior of resistance above TC.

Abstract

An intrinsic Josephson junction has been successfully fabricated without any micro-fabrication technique. Two Bi2212 whiskers were crossed with one another and joined by post-annealing. The inter-whisker electrical transport properties were measured by the four-probe method. The temperature dependence of resistance exhibited metallic behavior above TC. The resistance decreased to zero around 80K, corresponding to the superconducting transition. The current-voltage characteristics at 5K exhibited a small hysteresis and voltage jump, which can be explained by the intrinsic Josephson effect.