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The role of orbitals beyond the Cu 3d O 2pσ set employed in the widely used extended Hubbard model is considered with respect to low-energy charge excitations in cuprates. We focus on the description of the EELS and optical conductivity data of Sr 2 CuO 3 and Sr 2 CuO 2 Cl 2 with respect to O 2pπ states. Consequences for the orbital character of doped holes...
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