Characteristics of current flow in composites made from a high-temperature superconductor and the low-temperature superconducting metal oxide Ba(PbBi)O3

Composites are prepared from a high-temperature superconductor with the 1-2-3 structure and the low-temperature oxide BaPb_3/4Bi_1/4O₃ with various volume concentrations of the high-temperature and low-temperature superconductors. The temperature dependences of the electrical resistivities and critical current densities of the composites are measured. It is shown experimentally that these composites comprise a synthetically created network of Josephson weak links (with a specified degree of coupling). Fiz. Tverd. Tela (St. Petersburg) 39, 418–424 (March 1997) Deceased.