TY - JOUR
T1 - Observation of local crystal structure change in (CaxLa1-x)(Ba1.75-xLa0.25+x) Cu3O7+δ tetragonal superconductor using Raman scattering
AU - Sato, Yasushi
AU - Yoshioka, Kohtaro
AU - Petrykin, Valery
AU - Kakihana, Masato
AU - Tanaka, Yoshito
AU - Yamaguchi, Ai
AU - Katsumata, Takahiro
AU - Yasuoka, Hiroshi
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2002/5
Y1 - 2002/5
N2 - Polycrystalline samples of (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3 O7+δ (CLBCO) tetragonal superconductor for x from 0.0 to 0.6 were studied by Raman scattering technique, which is sensitive to oxygen site symmetry in the high-Tc superconductors. On the Raman spectra, five extra modes at 200, 320, 400, 565 and 610 cm-1, which did not appear on Raman spectra of tetragonal YBa2Cu3O6, were observed. Based on the model that apical oxygen O(4) is displaced by La3+ on Ba site and the result of group theoretical analysis for this model, the 565 cm-1 mode which possessed the strongest intensity among these extra modes could be assigned to another O(4) vibration. This indicates that O(4) is strongly attracted by La3+ on Ba site, resulting in a change of local structure.
AB - Polycrystalline samples of (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3 O7+δ (CLBCO) tetragonal superconductor for x from 0.0 to 0.6 were studied by Raman scattering technique, which is sensitive to oxygen site symmetry in the high-Tc superconductors. On the Raman spectra, five extra modes at 200, 320, 400, 565 and 610 cm-1, which did not appear on Raman spectra of tetragonal YBa2Cu3O6, were observed. Based on the model that apical oxygen O(4) is displaced by La3+ on Ba site and the result of group theoretical analysis for this model, the 565 cm-1 mode which possessed the strongest intensity among these extra modes could be assigned to another O(4) vibration. This indicates that O(4) is strongly attracted by La3+ on Ba site, resulting in a change of local structure.
KW - Amorphous citric acid method
KW - Cation disordering
KW - Cuprate superconductor
KW - Local crystal structure
KW - Raman scattering
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U2 - 10.2497/jjspm.49.372
DO - 10.2497/jjspm.49.372
M3 - Article
AN - SCOPUS:0036578392
VL - 49
SP - 372
EP - 376
JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
JF - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
SN - 0532-8799
IS - 5
ER -