Microstructure change during oxygen annealing and the effect on the levitation force of melt-textured Y - Ba - Cu - O superconductors
Chan-Joong Kim; Ki-Baik Kim; Il-Hyun Kuk; Gye-Won Hong; Yi-Sung Lee; Hyun-Soon Park
Журнал:
Superconductor Science and Technology
Дата:
1997-12-01
Аннотация:
The influence of oxygen annealing on the levitation force was studied for melt-textured multidomain YBCO samples cooled with and without magnetic field (field cooled (FC) and zero-field cooled (ZFC)). For both the FC and ZFC samples the repulsive force rapidly increased with increasing oxygen annealing time, reaching a maximum value at a certain annealing time and then slightly decreasing when the samples were further annealed. The attractive force of the FC samples followed a similar pattern to that of the repulsive force while the attractive force of the ZFC samples was small and nearly constant regardless of annealing time. The variation of the levitation force with oxygen annealing time is explained in terms of the microstructure developed during oxygen annealing.
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