FORMATION AND STABILITY OF A STRONG-COUPLING LARGE BIPOLARON IN THE LIGHTLY DOPED CUPRATES

Abstract

The ground-state energies of large polaron E p and bipolaron E B in three-dimensional lightly doped cuprates are calculated variationally taking into account the short- and long-range electron-phonon interactions and Coulomb correlation in the continuum model and adiabatic approximation. The binding energy of a large bipolaron and its stability region are determined as a function of the ratio of dielectric constants η = ε ∞ /ε 0 . It is found that the large bipolaron is stable in a broad region of η.

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DOI

10.1142/s0217979205029523

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