Influence of Pb addition on the superconducting properties of polycrystalline Sr0.6K0.4Fe2As2

Abstract

Polycrystalline Sr0.6K0.4Fe2As2 samples with various Pb additions (0-20 wt%) were prepared using a one-step solid state reaction. X-ray diffraction analysis shows no evidence for chemical reaction between the Pb and the FeAs-based superconductor. However, the presence of the Pb can affect the microstructure and superconducting properties of the final products. The critical transition temperature Tc indicates no degradation up to 20 wt% Pb addition, and dramatic improvements of magnetic Jc and irreversibility field Hirr were observed for appropriate Pb concentration. Transport critical current property of pure and Pb-added Sr0.6K0.4Fe2As2 tapes was also measured by a four-probe technique, and a remarkable enhancement of Jc at low fields was detected for the Pb added tapes.

17 pages, 7 figures. Supercond. Sci. Technol., accept

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Cited by in corpus (9)

• 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
• Realization of practical level current densities in Sr0.6K0.4Fe2As2 tape conductors for high-field applications
• High transport critical current densities in textured Fe-sheathed Sr1-xKxFe2As2+Sn superconducting tapes
• Development of Powder-in-Tube Processed Iron Pnictide Wires and Tapes
• Strongly enhanced current densities in Sr0.6K0.4Fe2As2 superconducting tapes
• Fabrication and transport properties of Sr0.6K0.4Fe2As2 multifilamentary superconducting wires
• 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