Abstract
Many-body effects in Cu 2p x-ray photoemission of Bi2Sr2CaxCu1+xO6+2x (x=0,1,2), La2−xSrxCuO4 (x=0,0.13), and ErBa2Cu3O7−x,y (x<y) were observed and correlations between the many-body effects and high-Tc superconductivity of cuprate superconductors were reviewed. For the Bi2Sr2CaxCu1+xO6+2x (x=0,1,2) and La2−xSrxCuO4 (x=0,0.13) systems, proper high-Tc superconductivity was realized by increasing the transfer integral and the interaction strength of the Cu-O bond of the crystal determined the superconducting properties. However, for the ErBa2Cu3O7−x and YBa2Cu3O7−x systems, 90 K superconductivity was realized by increasing the charge transfer energy. The extended valence state including the Cu, Ba, and O valence states in the crystal determined the superconducting properties of the ErBa2Cu3O7−x and YBa2Cu3O7−x systems.
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