Influences of inter- and intragrain current systems on the total magnetization in (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+x superconductors

In this study we examine the influences of inter- and intragrain current systems on the total magnetic flux distribution (magnetization) and its dynamics in polycrystalline (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+x superconductors at 77 K. For measurement taking we used a movable miniature Hall sensor. The total magnetic behavior was dominated by the magnetization of the intergrain system if the transport (intergrain) J_c of the samples was sufficiently high. The influences of intragrain magnetization were clearly visible and distinguishable but were of minor importance because of the domination of the grain magnetization equilibrium component. The relaxation of the intergrain screening currents was found to exhibit a strong dependence on the magnetic history.