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Showing papers on "Bipolaron published in 1978"


Journal ArticleDOI
TL;DR: In this article, the localized bipolaron state in ionic crystals is investigated taking account of the exchange interaction, and the state is shown to be thermally stable under all values of the parameter ϵ/n2 (ϵ is the dielectric constant, n is the index of refraction).
Abstract: The localized bipolaron state in ionic crystals is investigated taking account of the exchange interaction. The state is shown to be thermally stable under all values of the parameter ϵ/n2 (ϵ is the dielectric constant, n is the index of refraction). At large enough values of ϵ/n2 (> 26) the existence of two electron centres and positive vacancies is energetically profitable, and the one-electron (neutral) centres are absent. Such a situation is apparently realized in chalcogenide glasses where the local lattice distortions near the centres are large and hence the local polarization is large as well. [Russian Text Ignored].

3 citations