Premium
Localized Bipolarons in Ionic Crystals
Author(s) -
Vinetskii V. L.,
Kudykina T. A.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220870213
Subject(s) - bipolaron , ionic bonding , chalcogenide , condensed matter physics , polaron , ionic crystal , dielectric , electron , polarization (electrochemistry) , refractive index , lattice constant , lattice (music) , permittivity , materials science , chemistry , physics , ion , optics , quantum mechanics , optoelectronics , diffraction , acoustics
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/ n 2 (ϵ is the dielectric constant, n is the index of refraction). At large enough values of ϵ/ n 2 (> 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.