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Crossover between Anomalous Peak Effects Induced by Splayed and Tilted Columnar Defects in Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$
We investigated the magnetic field dependence of the critical current density (Jc) in Ba0.6K0.4Fe2As2 with various configurations of columnar defects (CDs) introduced by 2.6 GeV U or 320 MeV Au irradiations. Splayed CDs are introduced by crossing CDs at a specific angle with respect to the c-axis, while tilted CDs …