Analytical electron microscopic study of high-Tc superconductor Bi-Ca-Sr-Cu-O

Daisuke Shindo, Kenji Hiraga, Makoto Hirabayashi, Norio Kobayashi, Masae Kikuchi, Keiji Kusaba, Yasuhiko Syono, Yoshio Muto

    研究成果: Article査読

    10 被引用数 (Scopus)

    抄録

    Superconductors Bi-Ca-Sr-Cu-O containing high-Tc (110 K) and/or low-Tc (80 K) phases were investigated by analytical electron microscopy. In the sample containing the high-Tc phase, various stacking sequences formed with 2, 3 and 4 perovskite layers were observed by a lattice imaging technique. From EDX analysis, a considerable variation of composition with a higher Cu atomic fraction than that of low-Tc phase was detected. The structure of 3 perovskite layers is considered to be responsible for a superconducting transition at 110 K. A discrepancy between a volume fraction of the structure containing 3 perovskite layers and that of high-Tc phase expected from the magnetization experiment is discussed. Despite the differences of chemical composition and stacking period along the c-axis, a similar structural modulation with an incommensurate period along the b-axis was equally found in the high-Tc phase as the low-Tc phase.

    本文言語English
    ページ(範囲)L2048-L2051
    ジャーナルJapanese journal of applied physics
    27
    11 A
    DOI
    出版ステータスPublished - 1988 11

    ASJC Scopus subject areas

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

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