Abstract
Vortex pinning potential across a 5° tilt low angle grain boundary (GB) was evaluated by measuring angular dependences of critical current density in a bicrystal YBa2Cu3O7 film under the variable Lorentz force configuration. Trapping angles of the GB depend on directions in the GB plane (70°–80° and 15°–45° for the c-axis direction and the ab plane one, respectively), due to anisotropic pinning of GB dislocations. Pinning potential across a GB is as large as that of heavy ion irradiated columnar defects, indicating that density and distribution of GBs should be controlled to improve vortex pinning in coated conductors.
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