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Holes doped within the square CuO2 network specific to the cupratesuperconducting materials have oxygen 2p character. We investigate the basicproperties of such oxygen holes by wavefunction-based quantum chemicalcalculations on large embedded clusters. We find that a 2p hole inducesferromagnetic correlations among the nearest-neighbor Cu 3d spins. When movingthrough the antiferromagnetic background the hole must bring along this spinpolarization cloud at nearby Cu sites, which gives rise to a substantialreduction of the effective hopping parameters. Such interactions can explainthe relatively low values inferred for the effective hoppings by fitting theangle-resolved photoemission data. The effect of the backgroundantiferromagnetic couplings of renormalizing the effective nearest-neighborhopping is also confirmed by density-matrix renormalization-group modelHamiltonian calculations for chains and ladders of CuO4 plaquettes

Renormalization of quasiparticle hopping integrals by spin interactions in layered copper oxides