Abstract
Effects of bimodal splayed columnar defects in Ba1−xKxFe2As2 and Ba(Fe1−xCox)2As2 single crystals through 2.6 GeV U irradiation and 220 MeV Au irradiation are investigated. Magnetic field profiles measured by magneto-optical imaging clarified the presence of in-plane anisotropy of the critical current density (Jc) in 2.6 GeV U irradiated crystals, where Jc parallel to the splay plane is larger than that perpendicular to the splay plane. However, the in-plane anisotropy of Jc is absent in 220MeV Au irradiated crystals. Possible origin of this discrepancy is discussed based on the structure of introduced defects.
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