Abstract
We report the influence of atomic disorder introduced by sequentialneutron irradiation on the basic superconducting properties, flux pinningand grain connectivity. Two different polycrystalline Sm-1111 samples (SmFeAsO1 − xFx) and two Ba-122single crystals (BaFe1.8Co0.2As2) were investigated. The monotonic decrease of the transition temperature with neutronfluence degrades the upper critical field, at least in the investigated temperature region.Pinning, on the other hand, is largely improved, with a different optimal defectconcentration (fluence) in the two materials. The analysis of the current flow in thepolycrystalline samples reveals weak link behavior in the majority of grain connections andthe existence of stronger grain connections. The density of the latter seems to be close tothe percolation threshold (i.e. the minimum fraction for a continuous current path). Bothtypes of connections are sensitive to disorder and degrade upon neutron irradiation.
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