ELECTRONIC-STRUCTURE OF BI2SR2CA1-XYXCU2O8+DELTA - CU 2P X-RAY-PHOTOELECTRON SPECTRA AND OCCUPIED AND UNOCCUPIED LOW-ENERGY STATES

In this paper we will present measurements, using various kinds of spectroscopy, on the hole-doped compound Bi2Sr2Ca1-xY(x)Cu(2)O(8+delta), with x ranging from 0.0 to 1.0. Cu 2p x-ray photoelectron spectra are compared with cluster calculations using nonlocal screening effects. The consequences of hole doping and multiplet interaction are also studied. The photoemission and inverse-photoemission data indicate that the appearance of intensity at the Fermi level is a result of the shift of the chemical potential to the top of the valence band combined with a shift of spectral weight from high- to low-energy states.