126 K superconducting phase in the Ba-Ca-Cu-O system

C. W. Chu, Z. L. Du, Y. Cao, Y. Y. Xue, Y. Y. Sun, I. Rusakova, L. Gao

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


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 T1 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 cation ratio of Ba: Ca: Cu= 2: n - 1: n. Steps are being taken to improve the granularity and stability of the phases for a definitive structure determination.

Original languageEnglish
Pages (from-to)15-20
Number of pages6
JournalPhilosophical Magazine Letters
Issue number1
Publication statusPublished - 1997 Jan

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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