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The K- and Co-doped BaFe2As2 (Ba-122) superconducting compounds arepotentially useful for applications because they have upper critical fields(Hc2) of well over 50 T, Hc2 anisotropy Gamma < 2, and thin film criticalcurrent densities exceeding 1 MAcm-2 at 4.2 K. However, thin-film bicrystals ofCo-doped Ba-122 clearly exhibit weak link behavior for [001] tiltmisorientations of more than about 5 degrees, suggesting that texturedsubstrates would be needed for applications, as in the cuprates. Here wepresent a contrary and very much more positive result in which untexturedpolycrystalline (Ba0.6K0.4)Fe2As2 bulks and round wires with high grainboundary density have transport critical current densities well over 0.1 MAcm-2(SF, 4.2 K), more than 10 times higher than that of any other ferropnictidewire. The enhanced grain connectivity is ascribed to their much improved phasepurity and to the enhanced vortex stiffness of this low-anisotropy compound(Gamma ~ 1-2) compared to YBa2Cu3O7-x (Gamma ~ 5).

High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks