TY - JOUR
T1 - Characterization of Co-Substituted YBa2Cu3O7-d Superconductors by Raman Spectroscopy —Application of Raman Spectroscopy to High-Tc Superconductors (1)—
AU - Kakihana, Masato
AU - Fujimori, Hirotaka
AU - Yashima, Masatomo
AU - Yoshimura, Masahiro
AU - Mazaki, Hiromasa
AU - Yasuoka, Hiroshi
PY - 1993
Y1 - 1993
N2 - We have investigated the phonon Raman spectra of YBa2Cu3-xCoxO7-d ceramic samples prepared by a polymerized complex method using Raman microprobe collection optics. Defect induced Raman scattering from Cu(1)-O(1) chains has been observed in Co-substituted samples, suggesting that Co predominantly enters the chain site. With increasing Co content the frequencies of the Ba, Cu(2), 0(2)-0(3) and the apex oxygen 0(4) vibrational modes along caxis change considerably. The changes are compared with those of interatomic bond distances as obtained by neutron diffraction and they indicate charge transfer effects between the CuO chain and the CuO2 planes with increasing Co substitution. It is suggested that the O(4) mode is sensitive to small changes of the charge balance between the chain and the plane.
AB - We have investigated the phonon Raman spectra of YBa2Cu3-xCoxO7-d ceramic samples prepared by a polymerized complex method using Raman microprobe collection optics. Defect induced Raman scattering from Cu(1)-O(1) chains has been observed in Co-substituted samples, suggesting that Co predominantly enters the chain site. With increasing Co content the frequencies of the Ba, Cu(2), 0(2)-0(3) and the apex oxygen 0(4) vibrational modes along caxis change considerably. The changes are compared with those of interatomic bond distances as obtained by neutron diffraction and they indicate charge transfer effects between the CuO chain and the CuO2 planes with increasing Co substitution. It is suggested that the O(4) mode is sensitive to small changes of the charge balance between the chain and the plane.
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U2 - 10.2497/jjspm.40.1101
DO - 10.2497/jjspm.40.1101
M3 - Article
AN - SCOPUS:0027696151
VL - 40
SP - 1101
EP - 1106
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 - 11
ER -