Premium
On the mobility of delocalized and self‐trapped positronium states in ionic crystals
Author(s) -
Bondarev I. V.
Publication year - 2003
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.200301559
Subject(s) - delocalized electron , ionic bonding , positronium , adiabatic process , thermal diffusivity , atomic physics , polaron , condensed matter physics , scattering , inelastic scattering , materials science , molecular physics , chemical physics , physics , ion , thermodynamics , nuclear physics , quantum mechanics , positron , electron
The temperature dependence of the diffusivity is studied for delocalized and self‐trapped positronium (Ps) atoms in ionic crystals. Detailed calculations taking into account low‐temperature and inelastic scattering corrections and a Ps scattering form‐factor have been performed for delocalized Ps. Low‐temperature and inelastic corrections to the delocalized Ps diffusivity are shown to be essential below several tens of K, while the form‐factor contribution is negligibly small up to thousand K. The mobility of self‐trapped Ps is analyzed within the framework of a small polaron approach. The hopping contribution to the self‐trapped Ps diffusivity is shown to be adiabatic in its physical nature. The tunnel contribution is in general not small and may turn out to be dominating even at very high temperatures.