Author： Chu C. W. Du Z. L. Cao Y. Xue Y. Y. Sun Y. Y. Rusakova I. Gao L.
Publisher： Taylor & Francis Ltd
ISSN： 1362-3036
Source： Philosophical Magazine Letters, Vol.75, Iss.1, 1997-01, pp. : 15-20
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Abstract
We have detected a reproducible bulk superconducting transition in the Ba Ca Cu O system at 126 K under ambient pressure. This is the highest transition temperature in a compound system not containing volatile toxic elements such as Tl or Hg. Two other distinct transitions at about 105 and 90 K were also detected. Careful investigation shows that the 126 K superconducting and other phases cannot belong to any of the known layered cuprate compounds. They may belong, instead, to a new compound family with a n n cation ratio of Ba : Ca : Cu 2 :- 1 : . Steps are being taken to improve the granularity and stability of the phases for a definitive structure determination.
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