Effects of the vortex line shape on the critical current density in high Tc superconducting film with nanorod pinning centers

We studied the critical current density distribution in a coated conductor comprised of (Gd,Y)1Ba2Cu3O7−δ–BaZrO3 film. Transmission electron microscopy measurements showed that nanorod pinning centers tilt by ∼13° from the c-axis. Magneto-optical image (MOI) measurements showed interesting asymmetric distributions of magnetic flux density. From MOIs we calculated the asymmetric distributions of the critical current density, which is associated with the properties of vortex pinning. We were able to explain these results through the geometrical relationship of the tilted rod pinning centers and the curved vortex lines. (paper)