Abstract
Introduction of columnar defects to superconductors through swift-particle irradiation enhances their critical current density (Jc). Iron-based superconductors (IBSs) have been investigated as promising materials for practical applications because of their large Jc at high magnetic fields and temperatures. Recently, another promising IBS CaKFe4As4 (1144-type IBS) was found, and attracts much interest due to its high Jc in the pristine sample. We compare effects of 800 MeV Xe, 3 MeV proton, and 320 MeV Au irradiations on the critical temperature (Tc) and Jc of CaKFe4As4 single crystals, and compare them with irradiation effects in Ba0.6K0.4Fe2As2.
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