抄録
The electric field on the outermost shell of superconducting filaments depends directly on the current distribution inside a composite. Calculations are carried out taking into account the axial diffusion due to the resistivity of the matrix. Moreover, the critical state model is modified to account for the dependence of the local current density on the electric field. It is shown that a simple self field measurement is a very good way to evaluate the average transverse resistivity in a multifilament composite. Our samples made of very fine filaments show a resistivity in the range of a few 10-9Ω. m, i.e. much higher resistivity than that of the copper matrix itself. That resistivity decreases as the filament diameter increases. This fact shows that there exists a high resistive barrier at the interface between the superconductor and the copper.
