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

研究成果: Article › 査読

18 被引用数 (Scopus)

抄録

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.

本文言語	English
ページ（範囲）	L1050-L1053
ジャーナル	Japanese Journal of Applied Physics
巻	27
号	6A
DOI	https://doi.org/10.1143/JJAP.27.L1050
出版ステータス	Published - 1988 6
外部発表	はい

ASJC Scopus subject areas

工学（全般）
物理学および天文学（全般）

文献へのアクセス

10.1143/JJAP.27.L1050

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引用スタイル

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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",

month = jun,

doi = "10.1143/JJAP.27.L1050",

language = "English",

volume = "27",

pages = "L1050--L1053",

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TY - JOUR

T1 - Synthesis and superconductivity of a new high-TcTl-Ba-Ca-Cu-O phase

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

Y1 - 1988/6

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.

KW - Copper valence

KW - Electron microscopy

KW - High-T

KW - TI-Ba-Ca-Cu-O system

KW - X-ray diffraction

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