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We report that high transport critical current density exceeding 104 A/cm2 at4.2 K and 10 T can be obtained with good reproducibility for Ag sheathed(Ba,K)Fe2As2 (Ba 122) tapes by modifying the ex-situ powder-in-tube (PIT)method. The process involves cycles of the cold deformation and subsequent heattreatment. The intermediate cycles of flat rolling and heat treatment produceuniform fine-grained structure, resulting in an enhancement of transport Jc inapplied magnetic fields. However, the rolled tapes contain cracks runningtraverse to the tape axis, which still limit the current pass along the tapeaxis. We found that the application of uniaxial pressing with small reductionrate at the final stage is very effective to heal those cracks, resulting in anextraordinary increase of the transport Jc. We achieved the highest Jc (at 4.2K and 10 T) of 2.1x104 A/cm2 among the PIT processed Fe based wires and tapesreported so far. The Jc-H curves measured at higher temperatures maintains asmall filed dependence up to around 20 K, suggesting that the tapes arepromising for applications at higher temperatures as well as in liquid helium.

superconductor science and technology/superconductor science and technology

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