The magnetic flux dynamic in RE-Ba-Cu-O (RE = La, Nd, Sm, Eu or Gd) composite superconductors processed by the oxygen-controlled-melt-growth (OCMG) method was investigated by magneto-optical (M-O) technique using an iron-garnet film with in-plane magnetization. An external magnetic field H was applied parallel to sample's c-axis (H ∥ c) up to 5000 Oe at different temperatures. The field distribution as well as the current paths were clearly visualized and correlated to the sample microstructure. The M-O images were associated with the data obtained by analysing the magnetization curves. Critical current densities were calculated from magnetization hysteresis measurements. The direct and detailed knowledge of the field behaviour provided by the M-O images allows precise interpretation of the magnetization loops.
|ジャーナル||Superconductor Science and Technology|
|出版ステータス||Published - 2000 6 1|
|イベント||The 2nd International Workshop on the Processing and Applications of Superconducting (RE)CBO Large Grain Materials - Morioka, Jpn|
継続期間: 1999 10 19 → 1999 10 22
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