The magnetic levitation forces for single-grain bulks of Y-Ba-Cu-O and LRE-Ba-Cu-O/Ag with LRE = Sm,Gd

We have studied the distributions of the trapped field and the levitation forces for various large c-axis-oriented single-grain samples of LRE-Ba-Cu-O/Ag with LRE = Sm,Gd and Y-Ba-Cu-O prepared by the melt-process in air and a reduced oxygen atmosphere. Although the peak values of the trapped field vary from 1.0 to 1.5 T, the maximum values of the levitation force indicate 20 kgf for all the samples. Numerical analyses of the levitation force of the samples with various macro-J(c), have been performed, and the results we obtained have been able to give a consistent explanation to our experimental results described above.