Abstract
Insulating cuprates become insulator thanks to the strong Coulomb repulsion at Cu d orbitals. They have charge gap between filled oxygen 2p and empty Cu 3d states categorized as charge transfer insulators. Although only Cu 3d and O 2p states are involved in low energy optical transitions, optical excitation spectra of insulating cuprates show rich structures depending on the form of CuO4 networks. One dimensional chain systems with corner‐sharing plaquettes and edge‐sharing plaquettes provide basic characters of these transitions. Comparison of available spectra of two dimensional cuprates with one dimensional chain compound Sr2CuO3 suggests that excitonic effect is important in CuO2 planes.
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