Critical Current Density of YBa2Cu3O7-d Low-Angle Grain Boundaries in Self-Field

الأصل · EN

A study has been perfomed on the superconducting critical current density Jc flowing across low angle grain boundaries in epitaxial thin films of YBa2Cu3O7-d (YBCO). The materials studied were dual grain boundary rings deposited on SrTiO3 and containing 2, 3, 5 and 7 degree tilt boundaries. The current density in self-field was determined by magnetometric methods at temperatures from 5 K to Tc. We conclude that at the higher temperatures of coated conductor applications, there is limited potential for improving Jc by reducing the grain boundary angle below about 3 degrees.