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Effects of Asymmetric Splayed Columnar Defects on the Anomalous Peak Effect in Ba<sub>0.6</sub>K<sub>0.4</sub>Fe<sub>2</sub>As<sub>2</sub>
In order to enhance the critical current density (Jc) of superconductors, introduction of columnar defects (CDs) through swift-particle irradiation is effective. By dispersing the direction of CDs (splayed CDs), not only further enhancement of Jc has been confirmed but also an anomalous peak effect (APE) in Jc at a certain …