Realization of practical level current densities in Sr0.6K0.4Fe2As2 tape conductors for high-field applications

Abstract

122 type pnictide superconductors are of particular interest for high-field applications because of their large upper critical fields Hc2 (> 100 T), low Hc2 anisotropy r (< 2), and high thin-film critical current densities Jc (> 1 MA/cm2 at 4.2 K). Successful magnet applications require fabrication of polycrystalline superconducting wires that exhibit large in-field Jc, which is limited by poor grain coupling and weak-link behavior at grain boundaries. Here we report our recent achievement in the developing Sr0.6K0.4Fe2As2 tapes with transport Jc up to 0.1 MA/cm2 at 10 T and 4.2 K. This value is by far the highest ever recorded for iron based superconducting wires and has surpassed the threshold for practical application for the first time. The synergy effects of enhanced grain connectivity, alleviation of the weak-link behavior at grain boundaries, and the strong intrinsic pinning characteristics led to the superior Jc performance exhibited in our samples. This advanced Jc result opens up the possibility for iron-pnictide superconducting wires to win the race in high-field magnet applications.

18 pages, 6 figures, published version

References in corpus (4)

• Advantageous grain boundaries in iron pnictide superconductors
• High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks
• Strongly enhanced current densities in Sr0.6K0.4Fe2As2 superconducting 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

Cited by in corpus (24)

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• Fabrication and Transport Properties of 100 m Class Sr0.6K0.4Fe2As2 Wires and Pancake Coils
• Demonstration of an iron-pnictide bulk superconducting magnet capable of trapping over 1 T
• Enhancement of critical current densities in (Ba,K)Fe2As2 wires and tapes using HIP technique
• First performance test of 30 mm iron-based superconductor single pancake coil under 24 T background field
• High transport Jc in magnetic fields up to 28 T of stainless steel/Ag double sheathed Ba122 tapes fabricated by scalable rolling process
• Grain boundary characteristics of Fe-based superconductors
• High-performance Ba1-xKxFe2As2 superconducting tapes with grain texture engineered via a scalable and cost-effective fabrication
• Fabrication of small superconducting coils using (Ba,A)Fe2As2 (A: Na, K) round wires with large critical current densities
• Critical current density and microstructure of iron sheathed multifilamentary Sr1-xKxFe2As2/Ag composite conductors
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• 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
• Giant enhancement of critical current density at high field in superconducting (Li,Fe)OHFeSe films by Mn doping
• Chemical stability and superconductivity in Ag-sheathed CaKFe4As4 superconducting tapes
• Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface
• Slow Vortex Creep Induced by Strong Grain Boundary Pinning in Advanced Ba122 Superconducting Tapes
• Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication
• Increase of critical current density in FeSe superconductor by strain effect