TY - JOUR
T1 - Photoemission study of Bi2(Sr,Ca)3Cu2Oy
AU - Fujimori, A.
AU - Takekawa, S.
AU - Takayama-Muromachi, E.
AU - Uchida, Y.
AU - Ono, A.
AU - Takahashi, T.
AU - Okabe, Y.
AU - Katayama-Yoshida, H.
PY - 1989
Y1 - 1989
N2 - The electronic structure of Bi2(Sr,Ca)3Cu2Oy has been studied by photoemission and electron-energy-loss spectroscopy (EELS). From analysis of the Cu 2p core-level photoemission spectra, the Cu 3d-O 2p bond in the CuO2 layer is found to be more ionic than that in La2-xSrxCuO4 and YBa2Cu3Oy, which leads to a weaker superexchange coupling between the Cu2+ spins within the layer. Valence-band photoemission and EELS spectra suggest a significant shift of the Bi 6s contribution from the deep-lying Bi 6s-O 2p bonding states to the antibonding states in the O 2p band region as compared to the results of band-structure calculations on Bi2Sr2CaCu2O8. This is probably due to excess oxygen atoms around Bi, which may raise the Bi 6s orbital energy and provide the system with holes.
AB - The electronic structure of Bi2(Sr,Ca)3Cu2Oy has been studied by photoemission and electron-energy-loss spectroscopy (EELS). From analysis of the Cu 2p core-level photoemission spectra, the Cu 3d-O 2p bond in the CuO2 layer is found to be more ionic than that in La2-xSrxCuO4 and YBa2Cu3Oy, which leads to a weaker superexchange coupling between the Cu2+ spins within the layer. Valence-band photoemission and EELS spectra suggest a significant shift of the Bi 6s contribution from the deep-lying Bi 6s-O 2p bonding states to the antibonding states in the O 2p band region as compared to the results of band-structure calculations on Bi2Sr2CaCu2O8. This is probably due to excess oxygen atoms around Bi, which may raise the Bi 6s orbital energy and provide the system with holes.
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U2 - 10.1103/PhysRevB.39.2255
DO - 10.1103/PhysRevB.39.2255
M3 - Article
AN - SCOPUS:0000091285
SN - 0163-1829
VL - 39
SP - 2255
EP - 2260
JO - Physical Review B
JF - Physical Review B
IS - 4
ER -