Characteristics of normal conducting artificial pins in Nb-Ti multifilamentary composites

In order to reveal flux pinning characteristics for different pinning materials in superconductors, Nb-Ti multifilamentary composites having different materials, Nb, Ta, Cu-Ni and Cu introduced as artificial pinning centers (APC) were studied, Magnetization was measured to analyze critical temperature T_C and to obtain magnetic field dependence of pinning force density F_P. The F _P properties for APC are different from each other, in spite of almost the same design of pins. A simulation for the distribution of superconducting order parameter using a S-N multilayer model under a significant proximity effect was carried out on the basis of the G-L theory. The flux pinning properties calculated from the order parameter simulations were compared with those of experimental results. Qualitative agreement between them was obtained