Abstract
We report the discovery of three new phases in the Tl-Ca-Ba-Cu-O system, , one of which exhibits bulk superconductivity at ≃100 K. The crystal structures of these new materials are closely related to that of , the recently discovered 125-K superconductor. All of these compounds contain Cu perovskitelike units, but whereas these are separated by bilayer Tl-O sheets in the 125-K material, they are separated by monolayer Tl-O sheets in the new structures, enabling an examination of the effect of the coupling between successive Cu perovksite units on superconducting properties.
- Received 31 March 1988
DOI:https://doi.org/10.1103/PhysRevLett.61.750
©1988 American Physical Society