Abstract
Two superconducting phases, (2223) and (2122), both with onset near 120 K and zero resistivity at 100 K, have been isolated from samples in the Tl-Ca-Ba-Cu-O system. The new 2223 superconductor has a 5.40×5.40×36.25-A pseudotetragonal unit cell. The 2122 superconductor, which appears to be structurally related to , has a 5.44×5.44×29.55-A pseudotetragonal subcell. The 2223 phase is probably related to 2122 by the addition of extra calcium and copper layers.
- Received 22 February 1988
DOI:https://doi.org/10.1103/PhysRevLett.60.1657
©1988 American Physical Society