THE BEHAVIOR OF 100K SUPERCONDUCTING PHASE IN Pb-doped Bi-Ca-Sr-Cu-O SYSTEM

The ac magnetic susceptibility, the magnetoresistance R(H) and the dependence of the resistivity on temperature under different applied field were investigated in the Pb-doped Bi-Ca-Sr- Cu-O system. A superconducting phase with T_c~100K exists in this sintered sample. It forms a well connecting network, and therefore the Josephson coupling between the superconducting grains is sharply improved by doping lead.