Direct observation of the dynamics of vortices in high temperature superconducting bulks and development of the strong bulk magnet

为了研究高温超导块材在脉冲磁场中的涡旋动力学，测量了局部涡旋密度和温度。旋涡不仅在边缘处而且在表面处侵入本体。局部临界电流密度的分布，这是估计从磁化回路使用的小块从散装是一致的不均匀的捕获磁场分布。在低/高外加磁场下，涡旋被捕获在弱/强钉扎区。

To study the dynamics of vortices in high temperature superconducting bulks in the pulsed field, both local vortex densities and temperatures were measured. The vortices intruded into the bulk not only at the edges but also at the surfaces. The distribution of the local critical current density which was estimated from the magnetization loop using the small pieces cut from the bulk was consistent with the inhomogeneous trapped magnetic field profiles. The vortices were trapped at the weak /strong pinning region for the low/high applied magnetic field.