Abstract
We have shown that the unconventional temperature dependence of the static susceptibilityϰ(T) of the perovskite high-Tc superconductors above the superconducting transition temperatureTc can be explained in terms of two relevant band models containing the singlet-correlated oxygen band and the copper character band. The usual copper-oxygen Hamiltonian containing hopping and Coulomb repulsion terms has been reduced to an effective Hubbard-liket-t′-t″-Ueff model to describe the low-energy properties. The unusual behaviour of the susceptibility is due to thermally activated oxygen holes coming into the hybridization singularity peak in the density of states. A possible physical origin ofTmax in the temperature dependence of the susceptibility is discussed.
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