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Ag-sheathed CaKFe4As4 superconducting tapes have been fabricated via theex-situ powder-in-tube method. Thermal and X-ray diffraction analyses suggestthat the CaKFe4As4 phase is unstable at high temperatures. It decomposes intothe CaAgAs phase which reacts strongly with the silver sheath. We thereforesintered the tape at 500C and obtain a transport critical current densityJc(4.2 K, 0 T)~ 2.7x10^4 A/cm2. The pinning potential derived frommagnetoresistance measurements is one order of magnitude lower than that of the(Ba/Sr)1-xKxFe2As2 tapes. Combining with the scanning electron microscopy andmagneto-optical imaging results, we suggest that bad connectivity betweensuperconducting grains caused by the low sintering temperature is the mainfactor responsible for the low Jc. However, this system is still a promisingcandidate for superconducting wires and tapes if we further optimize thepost-annealing process to achieve better grain connectivity.

Chemical stability and superconductivity in Ag-sheathed CaKFe4As4 superconducting tapes