抄録
Due to its short coherence length, two-dimensional anisotropy and large thermal fluctuation at elevated operating temperatures, high Tc superconductors (HTS) show quite different electromagnetic properties from those of conventional lowtemperature metallic superconductors. In this paper, the peculiarity of critical currents and related phenomena in HTS, such as grain connectivity, spatial non-uniformity and large flux creep, are described in terms of the relationship to in-field currentvoltage characteristics, vortex glass-liquid phase transition and irreversibility field.
