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Improving transport current has been the primary issue for practicalapplication of superconducting wires and tapes. However, the porous nature ofpowder-in-tube (PIT) processed iron-based superconducting tapes is thought tobe one of the important reasons for the low Jc values. In this work, thesuperconducting core density of ex-situ Sr0.6K0.4Fe2As2 tapes was significantlyimproved by employing a simple hot pressing as an alternative route for finalsintering. At 4.2 K, the transport Jc values showed excellent values of5.1x10^4 A/cm^2 at 10 T and 4.3x10^4 A/cm^2 at 14 T, respectively, which attainthe Jc level desired for practical applications. Moreover, the Jc valuesexhibited extremely weak magnetic field dependence. These results clearlydemonstrate that PIT pnictide wire conductors are very promising for high fieldmagnet applications.

Strongly enhanced current densities in Sr0.6K0.4Fe2As2 superconducting tapes