“…4,6,11 For another example, a crossover on the magnetic relaxation rate curve dM /d ln(t) was predicted and observed as an effect of SB's. 14,18 Recently, the current density profiles of Bi-based HTSC crystals and silver-sheathed tapes have been measured with Hall sensors 7,12,[22][23][24][25] and the distributions of magnetic field have been visualized clearly by means of magnetooptical images. 3,[19][20][21] These experiments show that there exist surface zones with much higher j c than the inside.…”