Abstract
Flux pinning mechanism of the heavily lead-doped Bi(Pb)2212 single crystals was studied by the magneto-optical method. Largely different behaviors of J c (∥ a) and J c (∥ b) suggested that temperature-induced planar pinning site contributes to the excellent J c performance at high temperatures in magnetic field. For the Bi(Pb)2212/metal tapes, microstructure of superconducting layer was improved by addition of MgO fine particles or applying the amorphous to crystallization method. However, their transport J c's were still low compared with the lead-free Bi2212/Ag tapes.
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