Abstract
We analyze the influence of the dimensionality on the Cu 2p 3/2 core level X-ray photoemission spectra of undoped cuprates. Both exchange splitting and delocalization properties are described within one framework using a multi-band Hubbard model. The spectral intensity is calculated by means of the Mori–Zwanzig projection technique for a CuO 4 plaquette (‘zero’ dimensional), an infinite CuO 3 chain (one dimensional), and an infinite CuO 2 plane (two dimensional). The results are compared to the spectra of Bi 2 CuO 4, Sr 2 CuO 3 , and Sr 2CuO 2Cl 2. Our analysis allows to distinguish between effects of the Cu–O geometry and effects from material-specific properties.
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