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The high upper critical field and low anisotropy of iron-basedsuperconductors make them being particularly attractive for high-fieldapplications. However, the current carrying capability needs to be enhanced byovercoming the weak-link effect between misaligned grains inside wire and tapeconductors. 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 methodand optimized hot-press technique. The transport Jc measured at 4.2 K underhigh magnetic fields of 27 T is still on the level of 5.5x10^4 A/cm^2, which ismuch higher than those of low-temperature superconductors. This is the firstreport of hot-pressed Ba-122 superconducting tapes and these Jc values are byfar the highest ever reported for iron-based superconducting wires and tapes.These high-performance tapes exhibit high degree of c-axis texture of Ba-122grains and low anisotropy of transport Jc, showing great potential forconstruction of high-field superconducting magnets.

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