Anisotropy of the Critical Current Density and Intrinsic Pinning Behaviors of YBa₂Cu₃OyCoated Conductors

The intrinsic pinning mechanism of YBa 2 Cu 3 O y coated conductors was investigated in terms of the anisotropy of J c . The dissipation in the intrinsic pinning is mainly due to the double-kink excitation of the pinned vortices in the intermediate temperature region between 70 and 40 K. In this temperature region, the n -value is as small as about 8–10. At low temperature below 20 K, however, n -values become large and J c is independent of the magnetic field because of the reduction of the double-kink excitation of the vortices.