Anisotropy of the Critical Current Density and Intrinsic Pinning Behaviors of YBa₂Cu₃O_<i>y</i>Coated Conductors

Abstract

The intrinsic pinning mechanism of YBa2Cu3Oy coated conductors was investigated in terms of the anisotropy of Jc. 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 Jc is independent of the magnetic field because of the reduction of the double-kink excitation of the vortices.