X-RAY PHOTOEMISSION AND ELECTRON-ENERGY-LOSS SPECTROSCOPIC STUDIES OFSR2CUO2CL2

Sr2CuO2Cl2 represents a nearly ideal case of a 2-D antiferromagnetic C uO2-plane and thus is of particular interest in the context of the ori gins of high T-C superconductivity. We present high energy spectroscop ic results on single crystalline Sr2CuO2Cl2. Using electron-energy los s spectroscopy in transmission we have measured the loss function alon g the high symmetry directions in the CuO2-plane. X-ray photoemission spectroscopy is applied to study the valence band and the Cu 2p spectr um. Comparison of the experiment to a cluster calculation as given.