Pinning potential and AC susceptibility in superconducting Pb-Bi alloys

In oxide superconductors, the critical current are largely influenced by thermally activated flux creep at high temperature owing to their weak pinning strength. But, it is difficult to control the Dinning strength in high-temperature oxide superconductors. The pinning strengths of the superconducting rb-Bi alloys can be controlled easily by varying the Bi content. In order to investigate the effect of reversible motion of fluxoids, the AC susceptibility was measured for Pb-Bi alloys. The apparent pinning potentials and AC susceptibilities are systematically investigated for Pb-Bi alloys with different pinning strengths.