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

doi:10.1143/JJAP.27.L1050

Synthesis and superconductivity of a new high-T_cTl-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 journal › Article › peer-review

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 Tl₂Ba₂Ca₂Cu₃O_10+xassuming trivalent thallium. If the same average Cu valence as in YBa₂Cu₃O₇is assumed, this composition requires x=0.5 for oxygen.

Original language	English
Pages (from-to)	L1050-L1053
Journal	Japanese journal of applied physics
Volume	27
Issue number	6A
DOIs	https://doi.org/10.1143/JJAP.27.L1050
Publication status	Published - 1988 Jun
Externally published	Yes

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)

Access to Document

10.1143/JJAP.27.L1050

Cite this

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

In: Japanese journal of applied physics, Vol. 27, No. 6A, 06.1988, p. L1050-L1053.

Research output: Contribution to journal › Article › peer-review

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title = "Synthesis and superconductivity of a new high-TcTl-Ba-Ca-Cu-O phase",

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) {\AA} and c=35.586(9) {\AA}, 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.",

keywords = "Copper valence, Electron microscopy, High-T, TI-Ba-Ca-Cu-O system, X-ray diffraction",

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

year = "1988",

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AU - Kikuchi, Masae

AU - Kobayashi, Norio

AU - Iwasaki, Hideo

AU - Shindo, Daisuke

AU - Oku, Takeo

AU - Tokiwa, Ayako

AU - Kajitani, Tsuyoshi

AU - Hiraga, Kenji

AU - Syono, Yasuhiko

AU - Muto, Yoshio

PY - 1988/6

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N2 - 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.

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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