Abstract
High-quality single crystals of iron–platinum arsenides Ca10(PtnAs8)(Fe2−xPtxAs2)5 (n=3, 4) have been grown and their superconducting properties are characterized. The n=4 and n=3 compounds have Tc’s∼30K and 13K, respectively. Reflecting a modest anisotropy of the system, resistive transition for H//c-axis shows modest broadening in both systems. Magneto-optical imaging shows that superconductivity in both compounds is rather homogeneous, with the critical current density, Jc, ∼1×105A/cm2 at 5K under self-field. Proton irradiation up to 4×1016cm−2 into n=3 compound is found to have Tc suppression by ∼2K and Jc enhancement by a factor of three at low temperatures.
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