Superconducting properties and magneto-optical imaging of Ba0.6K0.4Fe2As2 PIT wires with Ag addition

Abstract

We have fabricated (Ba,K)Fe2As2 superconducting wires through ex-situ powder-in-tube method. Silver was used as a chemical addition to improve the performance of these superconducting wires. The transport critical current densities (Jc) have reached 1.3\times104 A/cm and 1.0\times104 A/cm2 at 4.2 K under self field in the wires with and without Ag addition. We used magneto-optical (MO) imaging technique to investigate the properties of grain boundaries in the (Ba,K)Fe2As2 superconducting wire with Ag addition. MO images show the weak links in the Fe-based superconducting wires for the first time. An intragranular Jc of 6.0\times104 A/cm2 at 20 K is obtained from MO image, which is consistent with the estimation from M-H measurement.

11 pages, 6 figures, to appear on Superconductor Sci. and Tech

References in corpus (3)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Determination of anisotropic Hc2 up to 60 T in (Ba0.55K0.45)Fe2As2 single crystals
• Fabrication of the iron-based superconducting wire using Fe(Se, Te)

Cited by in corpus (8)

• Recent advances in iron-based superconductors toward applications
• 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
• Enhanced upper critical field in Co-doped Ba122 superconductors by lattice defect tuning
• 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
• Large transport critical currents and magneto-optical imaging of textured Sr1-xKxFe2As2 superconducting tapes
• Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc
• Improvement of the superconducting properties of polycrystalline FeSe by silver addition