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
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.