Synthesis and superconductivity of a new high-TcTl-Ba-Ca-Cu-O phase

Masae Kikuchi, Norio Kobayashi, Hideo Iwasaki, Daisuke Shindo, Takeo Oku, Ayako Tokiwa, Tsuyoshi Kajitani, Kenji Hiraga, Yasuhiko Syono, Yoshio Muto

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


A 120 K-class superconductor in the Tl-Ba-Ca-Cu-O system was synthesized, and the flux exclusion proved to be greater than 90% of the perfect diamagnetism. X-ray and electron diffraction studies showed a tetragonal unit cell with lattice parameters a=5.4454(7) Å and c=35.586(9) Å, indicating triple perovskite-like layers interposed between Tl2O2layers. A structure model is proposed, in which the layer sequence along the c-axis is Tl2O2-BaO-CuO2-Ca-CuO2-Ca-CuO2-BaO. The chemical composition is Tl2Ba2Ca2Cu3O10+xassuming trivalent thallium. If the same average Cu valence as in YBa2Cu3O7is assumed, this composition requires x=0.5 for oxygen.

Original languageEnglish
Pages (from-to)L1050-L1053
JournalJapanese Journal of Applied Physics
Issue number6A
Publication statusPublished - 1988 Jun
Externally publishedYes


  • Copper valence
  • Electron microscopy
  • High-T
  • TI-Ba-Ca-Cu-O system
  • X-ray diffraction

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy


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