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.

arXiv comment22 pages, 8 figures

References in corpus (22)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Recent advances in iron-based superconductors toward applications
• Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
• High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks
• Determination of anisotropic Hc2 up to 60 T in (Ba0.55K0.45)Fe2As2 single crystals
• Enhancement of Critical Current Densities in Co-Doped BaFe${}_2$As${}_2$ with Columnar Defects Introduced by Heavy-Ion Irradiation
• Superconductivity-induced reentrance of orthorhombic distortion in Ba1-xKxFe2As2
• Very strong intrinsic supercurrent carrying ability and vortex avalanches in (Ba,K)Fe2As2 superconducting single crystals
• Realization of practical level current densities in Sr0.6K0.4Fe2As2 tape conductors for high-field applications
• Fabrication of the iron-based superconducting wire using Fe(Se, Te)
• Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals
• Complex phase diagram of Ba${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$: a multitude of phases striving for the electronic entropy
• Structural, Magnetic, and Superconducting Properties of Ba1-xNaxFe2As2
• Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes
• Fabrication and Transport Properties of 100 m Class Sr0.6K0.4Fe2As2 Wires and Pancake Coils
• Enhancement of critical current densities in (Ba,K)Fe2As2 wires and tapes using HIP technique
• Strongly enhanced current densities in Sr0.6K0.4Fe2As2 superconducting tapes
• Fabrication and transport properties of Sr0.6K0.4Fe2As2 multifilamentary superconducting wires
• Critical current density and microstructure of iron sheathed multifilamentary Sr1-xKxFe2As2/Ag composite conductors
• Enhancement of Critical Current Densities in (Ba,K)Fe2As2 by 320 MeV Au Irradiation in Single Crystals and by High-Pressure Sintering in PIT Wires

Cited by in corpus (7)

• 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
• Anisotropic physical properties and large critical current density in KCa${}_2$Fe${}_4$As${}_4$F${}_2$ single crystal
• 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