High transport current superconductivity in powder-in-tube Ba0.6K0.4Fe2As2 tapes at 27 tesla

Abstract

The high upper critical field and low anisotropy of iron-based superconductors make them being particularly attractive for high-field applications. However, the current carrying capability needs to be enhanced by overcoming the weak-link effect between misaligned grains inside wire and tape conductors. Here we demonstrate a high transport critical current density (Jc) reaching 1.5x10^5 A/cm^2 (Ic = 437 A) at 4.2 K and 10 T in Ba0.6K0.4Fe2As2 (Ba-122) tapes prepared by a combination of conventional powder-in-tube method and optimized hot-press technique. The transport Jc measured at 4.2 K under high magnetic fields of 27 T is still on the level of 5.5x10^4 A/cm^2, which is much higher than those of low-temperature superconductors. This is the first report of hot-pressed Ba-122 superconducting tapes and these Jc values are by far the highest ever reported for iron-based superconducting wires and tapes. These high-performance tapes exhibit high degree of c-axis texture of Ba-122 grains and low anisotropy of transport Jc, showing great potential for construction of high-field superconducting magnets.

23 pages, 6 figures

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Cited by in corpus (14)

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• 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
• Enhanced upper critical field in Co-doped Ba122 superconductors by lattice defect tuning
• Anisotropic physical properties and large critical current density in KCa${}_2$Fe${}_4$As${}_4$F${}_2$ single crystal
• A generalized phenomenological model for the magnetic field penetration and magnetization hysteresis loops of a type-II superconductor
• Asymmetric stress engineering of dense dislocations in brittle superconductors for strong vortex pinning
• Thermal response of the iron-based Ba122 superconductor to in situ and ex situ processes
• Effects of asymmetric splayed columnar defects on the anomalous peak effect in Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$
• Synthesis of $c$-axis textured CaKFe${}_4$As${}_4$ superconducting bulk via spark plasma texturing technique
• High-performance Ba1-xKxFe2As2 superconducting joints for persistent current operation
• Huge magnetostriction in superconducting single-crystalline BaFe${}_{1.908}$Ni${}_{0.092}$As${}_2$
• Observation of Uniform Supercurrent Flow in Polycrystalline K-doped Ba122 by Combined Magneto-optical Imaging and Finite-element Modeling