TY - JOUR
T1 - Analytical electron microscopic study of high-Tc superconductor Bi-Ca-Sr-Cu-O
AU - Shindo, Daisuke
AU - Hiraga, Kenji
AU - Hirabayashi, Makoto
AU - Kobayashi, Norio
AU - Kikuchi, Masae
AU - Kusaba, Keiji
AU - Syono, Yasuhiko
AU - Muto, Yoshio
PY - 1988/11
Y1 - 1988/11
N2 - 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.
AB - 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.
KW - Analytical electron microscopy
KW - Bi-Ca-Sr-Cu-O
KW - Electron diffraction study
KW - High-Tphase
KW - High-Tsuperconductor
KW - Lattice image
KW - Low-Tphase
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U2 - 10.1143/JJAP.27.L2048
DO - 10.1143/JJAP.27.L2048
M3 - Article
AN - SCOPUS:0024105392
VL - 27
SP - L2048-L2051
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 11 A
ER -