Abstract
We report the effects of heavy-ion irradiation in (Ba0.6K0.4)Fe2As2 single crystals including its dose dependence. We found that the suppression of Tc is weak up to a certain dose of irradiation. Critical current density (Jc) under self-field is strongly enhanced up to 15MAcm−2 at 2K by the introduction of defects through irradiations with different energies and ion species. This upper limit is in agreement with the previous report for that in cuprate superconductors. The dose dependence of Jc follows BΦ1/2, which can be explained by the simple scenario on the interaction between a driven vortex and discontinuous columnar defects.
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