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The London penetration depth was measured in optimally doped Ba0.6K0.4Fe2As2crystals, with and without columnar defects produced by 1.4 GeV 208Pbirradiation. The low temperature behavior of unirradiated samples wasconsistent with a fully gapped superconducting state with a minimum energy gapdelta_min/(k_B T_C) = 1. Similar gap values were observed for irradiationlevels corresponding to mean column-column separations of 32 nm and 22 nm. Atvery high irradiation levels (column-column separation of 10 nm) a T^2 powerlaw was observed below Tc/3, most likely due to elevated scattering. Neitherthe location nor the sharpness of the superconducting transition was affectedby irradiation. The data provides evidence for an s+/- pairing state.

Effect of Heavy-Ion Irradiation on Superconductivity in Single Crystals of Ba0.6K0.4Fe2As2 Pnictide Superconductor