Enhancement of critical current densities in (Ba,K)Fe2As2 wires and tapes using HIP technique

TL;DR

This paper reports significant improvements in the critical current densities of (Ba,K)Fe2As2 superconducting wires and tapes using hot isostatic pressing, achieving record-high values and discussing potential further enhancements.

Contribution

The study demonstrates the effectiveness of HIP technique in significantly enhancing the critical current densities of (Ba,K)Fe2As2 superconducting wires and tapes, with record-high performance achieved.

Findings

Record-high Jc of 175 kA/cm2 at 4.2 K in HIP round wire

Jc exceeds 20 kA/cm2 at 100 kOe field

Jc of 380 kA/cm2 at zero field in HIP tape

Abstract

(Ba,K)Fe2As2 superconducting wires and tapes are fabricated by using hot isostatic pressing (HIP) technique, and their superconducting properties are studied. In the HIP round wire, transport critical current density (Jc) at 4.2 K has achieved record-high value of 175 kA/cm2 at zero field, and exceeds 20 kA/cm2 even at 100 kOe. Improvement of polycrystalline powder synthesis may play a key role for the enhancement of Jc. In the HIP tape, even larger transport Jc of 380 kA/cm2 is realized at zero field. Based on magnetization and magneto-optical measurements, possible further enhancement of Jc is discussed.