E-J properties and local Jc distribution of practical Ag-sheathed Bi2Sr2CaCu2O8 tapes

E-J properties of the high-T, superconductors are related to the distribution of the flux pinning strength and the local critical current density J(c1). From the previous result of Bi2212 thick films, we found that the distribution of the local J(c) is much affected by microstructures, and the local J(c) distribution becomes broad and asymmetric for well aligned plate-like Bi2212 grains. These microstructures are similar to the case of practical Ag sheathed Bi2212 tapes. In this study, we performed E-J measurements of practical Ag sheathed Bi2212 tapes at various temperatures and magnetic fields, and the local Jc distribution was investigated.