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

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

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

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
Volume27
Issue number6A
DOIs
Publication statusPublished - 1988
Externally publishedYes

Fingerprint

Superconductivity
superconductivity
Diamagnetism
Thallium
diamagnetism
thallium
synthesis
Model structures
exclusion
Chemical analysis
Electron diffraction
Perovskite
Superconducting materials
Lattice constants
lattice parameters
chemical composition
electron diffraction
Fluxes
valence
X ray diffraction

Keywords

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

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Kikuchi, M., Kobayashi, N., Iwasaki, H., Shindo, D., Oku, T., Yamamoto, A., ... Muto, Y. (1988). Synthesis and superconductivity of a new high-TcTl-Ba-Ca-Cu-O phase. Japanese Journal of Applied Physics, 27(6A), L1050-L1053. https://doi.org/10.1143/JJAP.27.L1050

Synthesis and superconductivity of a new high-TcTl-Ba-Ca-Cu-O phase. / Kikuchi, Masae; Kobayashi, Norio; Iwasaki, Hideo; Shindo, Daisuke; Oku, Takeo; Yamamoto, Ayako; Kajitani, Tsuyoshi; Hiraga, Kenji; Syono, Yasuhiko; Muto, Yoshio.

In: Japanese Journal of Applied Physics, Vol. 27, No. 6A, 1988, p. L1050-L1053.

Research output: Contribution to journalArticle

Kikuchi, M, Kobayashi, N, Iwasaki, H, Shindo, D, Oku, T, Yamamoto, A, Kajitani, T, Hiraga, K, Syono, Y & Muto, Y 1988, 'Synthesis and superconductivity of a new high-TcTl-Ba-Ca-Cu-O phase', Japanese Journal of Applied Physics, vol. 27, no. 6A, pp. L1050-L1053. https://doi.org/10.1143/JJAP.27.L1050
Kikuchi, Masae ; Kobayashi, Norio ; Iwasaki, Hideo ; Shindo, Daisuke ; Oku, Takeo ; Yamamoto, Ayako ; Kajitani, Tsuyoshi ; Hiraga, Kenji ; Syono, Yasuhiko ; Muto, Yoshio. / Synthesis and superconductivity of a new high-TcTl-Ba-Ca-Cu-O phase. In: Japanese Journal of Applied Physics. 1988 ; Vol. 27, No. 6A. pp. L1050-L1053.
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AU - Oku, Takeo

AU - Yamamoto, Ayako

AU - Kajitani, Tsuyoshi

AU - Hiraga, Kenji

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AU - Muto, Yoshio

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AB - 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.

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