T. Tomoyose et al., IONIC DIELECTRIC FUNCTION OF ALPHA-AGI BASED UPON HUBBARD-BEEBY THEORY, Journal of the Physical Society of Japan, 64(7), 1995, pp. 2465-2469
A frequency and wave vector dependent dielectric function of alpha-AgI
is studied by using a phonon description based on a modified Hubbard-
Beeby theory. The frequency dependent dielectric function is character
ized by a main LO phonon peak and a sub LA phonon peak. The frequency
spectrum for the dielectric function is consistent with those for the
ac conductivity and the charge density dynamical structure factor of a
lpha-AgI.