Abstract
We have studied an effect of uniaxial strain to the temperature of Bose–Einstein condensation of intersite bipolarons within the framework of extended Holstein–Hubbard model. Uniaxial lattice strains are taken into an account by introducing a generalized density–displacement type force for electron–lattice interaction. Associating the superconducting critical temperature T c with the temperature of Bose–Einstein condensation T BEC of intersite bipolarons we have calculated strain derivatives of T BEC and satisfactorily explained the results of the experiments on La-based high- T c films.
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