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The tetragonal FeSe phase is an intensively investigated iron basedsuperconductor. In this study we examined the influence of Ag addition on thesuperconducting properties of selenium deficient polycrystalline FeSe0.94. Thesamples were obtained by solid state reaction and melting methods. XRD analysisshows the presence of tetragonal phase and EDX analysis establishesinhomogeneous Ag distribution in the grains. The superconducting propertieswere investigated by fundamental and third harmonic AC magnetic susceptibility.The intergranular critical current determined from AC magnetic susceptibilityin the Ag doped sample is several times higher than that in the undoped one,obtained by melting at approximately the same temperatures. Intra-granularcurrent is field independent up to almost 1000 Oe. Using the temperaturedependence of third harmonic AC magnetic susceptibility at different DCmagnetic fields, the irreversibility lines were obtained for all samples. It isfound that Ag addition increased the irreversibility field in comparison withundoped melted and powder sintered samples. All results show that the Agaddition in selenium deficient (FeSe0.94) samples leads to improvement ofinter- and intra- granular properties: screening ability, pinning, activationenergy and critical current and improves the irreversibility line.

The effect of Ag addition on the superconducting properties of the FeSe system