Fabrication of binary FeSe superconducting wires by novel diffusion process

TL;DR

This paper presents a novel Fe-diffusion in-situ process for fabricating high-performance FeSe superconducting wires with improved critical current density and transition temperature.

Contribution

Introduction of a simple Fe-diffusion PIT method enabling fabrication of multi-core FeSe wires with enhanced superconducting properties.

Findings

Transport Jc up to 1027 A/cm2 at 4.2 K

Tczero increased to 10.5 K, 2 K higher than bulk

Method suitable for high-quality multi-core FeSe wires

Abstract

We report successful fabrication of multi- and mono-core FeSe wires with high transport critical current density Jc using a simple in-situ Fe-diffusion process based on the powder-in-tube (Fe-diffusion PIT) method. The seven-core wire showed transport Jc of as high as 1027 A/cm2 at 4.2 K. The superconducting transition temperature Tczero was observed at 10.5 K in the wire-samples, which is about 2 K higher than that of bulk FeSe. The Fe-diffusion PIT method is suitable for fabricating multi-core wires of the binary FeSe superconductors with superior properties.