Abstract
Abstract GdBa 2 Cu 3 O y (GdBCO) coated conductors were irradiated using 270 MeV Xe ions at crossing angles ± θ i relative to the c -axis, in order to clarify the flux pinning properties of splayed columnar defects (splayed CDs) not only around B || c -axis, but also around B || ab -plane. For the splayed CDs with smaller θ i (i.e. crossing around the c -axis), a single peak is observed around B || c -axis in the angular dependence of critical current density J c , which are attributed to the splay effect by the crossed CDs. For the splayed CDs with larger θ i (i.e. crossing around the ab -plane), on the other hand, two sharp J c peaks emerge near two irradiation angles ± θ i and the J c at B || ab -plane indicates not a peak but a dip structure. With diminishing the crossing angles of CDs relative to ab -plane, the value of J c at B || ab -plane build up with the dip structure remained. These results suggest that the splayed CDs contribute to the flux pinning around the ab -plane, but do not induce the splay effect at B || ab -plane.
Published Version
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