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Elementary excitations in the metallic CuO2 planes of high-Tc systems.

We determine from a two-band Hubbard Hamiltonian the spin susceptibility and the self-energy for the holes in the CuO 2 planes. From this, the quasiparticle lifetime τ, the spectral density, the electrical resistivity p resulting from spin scattering, and the NMR relaxation rate l/T 1 at Cu sites are calculated. Our results, which are expected to be valid for larger hole doping, are in reasonable agreement with experiment and indicate that an interplay of narrow-band phenomena and spin fluctuations leads to the observed anomalous normal-state properties