Photoelectron measurements made on the high-T c superconductor single crystals of Bi2(Sr, Ca)3Cu2O x using synchrotron radiation of 35–120 eV revealed a valence band satellite due to the two-hole bound state, which indicated considerable large intra-atomic Coulomb energy between Cu-3d electrons. The density of states on the Fermi level was clearly observed. This feature is quite different from those of the La-Sr-Cu-O and Y-Ba-Cu-O systems.
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Maeda et al. (1989) studied this question.
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