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

Abstract

The K- and Co-doped BaFe2As2 (Ba-122) superconducting compounds are potentially useful for applications because they have upper critical fields (Hc2) of well over 50 T, Hc2 anisotropy Gamma < 2, and thin film critical current densities exceeding 1 MAcm-2 at 4.2 K. However, thin-film bicrystals of Co-doped Ba-122 clearly exhibit weak link behavior for [001] tilt misorientations of more than about 5 degrees, suggesting that textured substrates would be needed for applications, as in the cuprates. Here we present a contrary and very much more positive result in which untextured polycrystalline (Ba0.6K0.4)Fe2As2 bulks and round wires with high grain boundary 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 ferropnictide wire. The enhanced grain connectivity is ascribed to their much improved phase purity and to the enhanced vortex stiffness of this low-anisotropy compound (Gamma ~ 1-2) compared to YBa2Cu3O7-x (Gamma ~ 5).

Final version published in Nature Materials

References in corpus (21)

• New Fe-based superconductors: properties relevant for applications
• Advantageous grain boundaries in iron pnictide superconductors
• High-field superconductivity in alloyed MgB2 thin films
• Template engineering of Co-doped BaFe2As2 single-crystal thin films
• Fishtail effect and the vortex phase diagram of single crystal Ba0.6K0.4Fe2As2
• Weak-link behavior of grain boundaries in superconducting Ba(Fe1-xCox)2As2 bicrystals
• Significant enhancement of upper critical fields by doping and strain in Fe-based superconductors
• Very strong intrinsic supercurrent carrying ability and vortex avalanches in (Ba,K)Fe2As2 superconducting single crystals
• The behavior of grain boundaries in the Fe-based superconductors
• Biaxially textured cobalt-doped BaFe2As2 films with high critical current density over 1 MA/cm2 on MgO-buffered metal-tape flexible substrates
• Electromagnetic, atomic-structure and chemistry changes induced by Ca-doping of low-angle $YB{a}_{2}C{u}_3{O}_{7-\delta }$ grain boundaries
• Superconducting properties of SmO1-xFxFeAs wires with Tc = 52 K prepared by the powder-in-tube method
• Large transport critical currents of powder-in-tube Sr0.6K0.4Fe2As2/Ag superconducting wires and tapes
• The critical current of YBa2Cu3O7-d Low Angle Grain Boundaries
• Intergrain current flow in a randomly oriented polycrystalline SmFeAsO0.85 oxypnictide
• High transport critical current densities in textured Fe-sheathed Sr1-xKxFe2As2+Sn superconducting tapes
• Fabrication and characterization of iron pnictide wires and bulk materials through the powder-in-tube method
• Effective Ex-Situ Fabrication of F-Doped SmFeAsO Wire for High Transport Critical Current Density
• Low-temperature synthesis of SmFeAsO0.7F0.3 wires with high transport critical current density
• Evidence for electromagnetic granularity in polycrystalline Sm1111 iron-pnictides with enhanced phase purity
• Enhanced critical current properties in Ba0.6K0.4+xFe2As2 superconductor by over-doping of potassium

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