Phases with superconducting onset temperatures of 60, 87, and 112 K have been identified in the new superconductor Bi2Sr3-xCaxCu2O8+. The microstructures of two crystal types, one associated with the 87- and 60-K phases, and the other probably with the 112-K phase, have been examined by electron microscopy. The first crystal type has a superlattice structure which is incommensurate for the lower-temperature preparations. The second type of crystal, which forms at higher temperatures, has no superlattice structure.
ASJC Scopus subject areas
- Condensed Matter Physics