Strongly enhanced current densities in Sr0.6K0.4Fe2As2 superconducting tapes

Abstract

Improving transport current has been the primary issue for practical application of superconducting wires and tapes. However, the porous nature of powder-in-tube (PIT) processed iron-based superconducting tapes is thought to be one of the important reasons for the low Jc values. In this work, the superconducting core density of ex-situ Sr0.6K0.4Fe2As2 tapes was significantly improved by employing a simple hot pressing as an alternative route for final sintering. At 4.2 K, the transport Jc values showed excellent values of 5.1x10^4 A/cm^2 at 10 T and 4.3x10^4 A/cm^2 at 14 T, respectively, which attain the Jc level desired for practical applications. Moreover, the Jc values exhibited extremely weak magnetic field dependence. These results clearly demonstrate that PIT pnictide wire conductors are very promising for high field magnet applications.

25 pages, 7 figures, published version

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Cited by in corpus (13)

• Recent advances in iron-based superconductors toward applications
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Realization of practical level current densities in Sr0.6K0.4Fe2As2 tape conductors for high-field applications
• Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes
• Enhancement of critical current densities in (Ba,K)Fe2As2 wires and tapes using HIP technique
• High transport Jc in magnetic fields up to 28 T of stainless steel/Ag double sheathed Ba122 tapes fabricated by scalable rolling process
• Fabrication of small superconducting coils using (Ba,A)Fe2As2 (A: Na, K) round wires with large critical current densities
• Enhancement of critical current density in (Ba,Na)Fe2As2 round wires using high-pressure sintering
• Role of heat and mechanical treatments in the fabrication of superconducting Ba0.6K0.4Fe2As2 ex-situ Powder-In-Tube tapes
• Vortex pinning and dynamics in high performance Sr0.6K0.4Fe2As2 superconductor
• Large transport Jc in Cu-sheathed Sr0.6K0.4Fe2As2 superconducting tape conductors
• Enhancement of transport critical current density of SmFeAsO1-xFx tapes fabricated by an ex-situ powder-in-tube method with a Sn-presintering process
• Achievement of practical level critical current densities in PIT Ba1-xKxFe2As2/Ag tapes by conventional cold mechanical deformation