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Enhancement and non-monotonic field dependence of critical current density ( J c ), called anomalous peak effect, were observed in Ba 1− x K x Fe 2 As 2  with splayed columnar defects. In principle, anisotropy of in-plane  J c should be present in this superconductor since the introduced splayed columnar defects introduce anisotropy in the plane. This study reports in-plane anisotropy of  J c observed in 2.6 GeV U irradiated Ba 0.6 K 0.4 Fe 2 As 2  with splay angles of ±15° and ±20°. Results show that  J c component parallel to the splay plane is larger than the perpendicular component, and the parallel component contribute to the anomalous peak effect at around  B Φ /3 more.

Anisotropic Critical Current Densities in Ba0.6K0.4Fe2As2 with Splayed Columnar Defects

Anisotropic Critical Current Densities in Ba_0.6K_0.4Fe₂As₂ with Splayed Columnar Defects