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In this lecture we present some interesting issues that arise when the dynamics of the charge carriers in the CuO2 planes of high temperature superconductors is considered. Based on the qualitative picture of doping, set by experiments and some previous calculations, we consider the strength of the various inter- and intra-cell charge transfer susceptibilities, the question of Coulomb screening and...
The effect of charge fluctuations on the electronic and Raman spectra of high-temperature superconductors is examined, using the slave boson approach to the large Coulomb repulsion U d on the copper site. Instead of the saddle point approximation (b) ≠0 for the slave boson, characteristic for various N→∞ approaches, we confine ourselves to the non-crossing approximation (NCA) diagrams for...
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