Enhancement of critical current density in (Ba,Na)Fe2As2 round wires using high-pressure sintering

Abstract

We fabricated (Ba,Na)Fe2As2 superconducting wires using the powder-in-tube method and hot isostatic pressing. By improving powder synthesis processes compared with previous studies, highly pure raw materials for the wire fabrication were obtained. The largest transport critical current density (Jc) reached 40 kAcm-2 at T = 4.2 K under a magnetic field of 100 kOe. This value exceeds not only the value of transport Jc of the previous (Ba,Na)Fe2As2 wire but also those of all iron-based superconducting round wires. Improvements of polycrystalline powder synthesis play a key role for the enhancement of Jc. Furthermore, it was clarified that higher densification by high-pressure sintering and the texturing of grains in the core of the wire due to drawing also increased Jc effectively. Advantages of (Ba,Na)Fe2As2 wires compared with (Ba,K)Fe2As2 wires are also discussed.

22 pages, 8 figures

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Cited by in corpus (6)

• Superconducting materials: Challenges and opportunities for large-scale applications
• Fabrication of small superconducting coils using (Ba,A)Fe2As2 (A: Na, K) round wires with large critical current densities
• Strengthened proximity effect at grain boundaries to enhance inter-grain supercurrent in Ba1-xKxFe2As2 superconductors
• Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
• High-pressure growth effect on the properties of high-Tc iron-based superconductors: A short review
• Enhancement of the critical current by surface irregularities in Fe-based superconductors