Large transport critical currents of powder-in-tube Sr0.6K0.4Fe2As2/Ag superconducting wires and tapes

Abstract

We report significant transport critical currents firstly achieved in Sr0.6K0.4Fe2As2 wires and tapes with a Tc = 34 K, which were fabricated through an in-situ powder-in-tube process. Silver was used as a chemical addition as well as a sheath material. Transport measurements were performed by a standard four-probe resistive method. All the wire and tape samples have shown transport properties. Critical current density Jc was enhanced upon silver addition, and at 4.2 K, a best Jc of ~1200 A/cm^2 (Ic = 9 A) was achieved for 20 % silver added tapes, which is the highest in iron-based wires and tapes so far. The Jc is almost field independent between 1 T and 10 T, exhibiting a strong vortex pinning. Such a high transport critical current density is attributed to the absence of reaction layer between the silver sheath and superconducting core, as well as an improved connectivity between grains. We also identify a weak-link behavior from the creep drop of Jc at low fields and a hysteretic phenomenon. Finally, we found that compared to Fe, Ta and Nb tubes, Ag was the best sheath material for the fabrication of high-performance 122 type pnictide wires and tapes.

14 pages, 4 figures

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Cited by in corpus (27)

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• Progress in wire fabrication of iron-based superconductors
• The behavior of grain boundaries in the Fe-based superconductors
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• High transport current superconductivity in powder-in-tube Ba0.6K0.4Fe2As2 tapes at 27 tesla
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• Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• Mechanochemical synthesis of pnictide compounds and superconducting Ba0.6K0.4Fe2As2 bulks with high critical current density
• Development of Powder-in-Tube Processed Iron Pnictide Wires and Tapes
• Low-temperature synthesis of SmFeAsO0.7F0.3 wires with high transport critical current density
• Strongly enhanced current densities in Sr0.6K0.4Fe2As2 superconducting tapes
• Evidence for electromagnetic granularity in polycrystalline Sm1111 iron-pnictides with enhanced phase purity
• 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
• Influence of Pb addition on the superconducting properties of polycrystalline Sr0.6K0.4Fe2As2
• Vortex pinning and dynamics in high performance Sr0.6K0.4Fe2As2 superconductor
• Improved transport critical currents in Ag and Pb co-doped BaxK1-xFe2As2 superconducting tapes
• Enhanced high-field transport critical current densities observed for the ex-situ PIT processed Ag/(Ba,K)Fe2As2 thin tapes
• Large enhancement of transport critical current density of ex-situ PIT Ag/(Ba,K)Fe2As2 tapes achieved by applying cycles of cold deformation and heat treatment
• Large transport Jc in Cu-sheathed Sr0.6K0.4Fe2As2 superconducting tape conductors
• Large transport critical currents and magneto-optical imaging of textured Sr1-xKxFe2As2 superconducting tapes
• Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface
• Heat treatment effects on the superconducting properties of Ag-doped SrKFeAs compound