Abstract
1. The model with local anharmonicity (Műller model) [1] involving Hub. bard-type electron correlations as well as interaction between electrons and vibrational modes which can be represented in terms of pseudospin variables, is one of the used in the theory of high-Tc superconductivity. Vibrations of apex oxygen Ow possess anharmonicity in the case of YBaCuO-type systems. Their possible importance for charge transfer to or from the CuO layers, superconducting pairing of electrons and connection with observed high values of dielectric permittivity ezz was mentioned in several papers [2, 3]. 2. Hamiltonian of the model [1] has the following form:
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