Key points are not available for this paper at this time.
A stable and reproducible superconductivity transition between 80 and 93 K has been unambiguously observed both resistively and magnetically in a new Y-Ba-Cu-O compound system at ambient pressure. An estimated upper critical field H₂₂ (0) between 80 and 180 T was obtained.
Wu et al. (1987) studied this question.