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A considerable enhancement of the superconducting transition temperature T c in perovskite-type oxides is explained in the framework of the anharmonic model for superconductors with structurally unstable lattices. It is shown that the interaction of electrons with highly anharmonic oxygen-ion vibrations of a rotational type results in a sufficiently large coupling constant λ. The obtained estimation for T c is in agreement with experimental data for La(Y)BaCuO systems.
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Плакида et al. (1987) studied this question.
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