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Transmission Electron Microscope Studies of Intergrowth in BiSrCaCu2Ox and High-Tc Superconducting Phase

Growth defects such as intergrowths were studied in a recently found high-Tc multiphase oxide of the composition BiSrCaCu2Ox, using electron microscopes. It demonstrated well-established two-step superconducting transitions at 75 K and 105 K. The superconducting phase was found to be of banded structure. Each band extended normal to the c axis. The bands were found to have different c lattice parameters, i.e. 30, 36 and 42 Å. The difference was found to arise from the different thicknesses of the perovskite-like layers separated by layered Bi-O units. It is argued that the bands with c = 30 Å and c = 36 Å are responsible for the 75 K and 105 K phases, respectively.