Fabrication of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+/spl delta// films and intrinsic Josephson junctions

We have investigated Bi/sub 2/Sr/sub 2/Ca/sub 1/Cu/sub 2/O/sub 8+/spl delta// (Bi2212) films made by pulsed laser ablation technique with various compositions of the target material like Bi/sub 2/Sr/sub 2/Ca/sub 1/Cu/sub 2/O/sub 8/, Bi/sub 4/Sr/sub 2/Ca/sub 1/Cu/sub 2/O/sub 8/ (Bi4212), Bi/sub 2/Sr/sub 2/Ca/sub 1/Cu/sub 4/O/sub 8/ (Bi2214) and Bi/sub 4/Sr/sub 3/Ca/sub 3/Cu/sub 4/O/sub 8/ (Bi4334). Films from Bi2212 and Bi4334 targets show onset at T/sub c//spl sim/91 K and zero resistance at /spl sim/84 K and 71 K respectively. The Bi2214 films show an onset at /spl sim/91 K and zero resistance at /spl sim/60 K. Unlike these, Bi4212 films do not exhibit any superconducting transition. We also report a comparison of the microstructure, connectivity and crystallinity of these films determined by AFM and XRD. In addition, the fabrication of intrinsic junctions in films deposited on high angle step edges on SrTiO/sub 3/ is reported.