Dynamical Structure Factors of α-AgI Based upon Hubbard-Beeby Theory

概要

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A modified Hubbard-Beeby theory is used to calculate the dynamical structure fac-tors of the superionic conductor cv-Agl. It is found that the partial dynamical struc-ture factors of cations and anions are almost the same at long wavelengths but verydifferent at short wavelengths. From analysis of the partial dynamical structure fac-tors it is found that the vibrational motion of cations is strongly correlated with thelow-frequency longitudinal acoustic mode of the anion sublattice at longwavelengths. It is also found that this cation motion has no correlation with the high-frequency longitudinal optical mode of the anion sublattice at short wavelengths.These results closely resemble those of the molecular dynamics performed by Kanekoand Ueda except for the lack of a quasielastic peak. However, the cation motion has astrong correlation with the longitudinal acoustic mode even at short wavelengths.[cr-Agl,superionic conductor, dynamical structure factor,response function,cod- ][ lective motion, Hubbard-Beeby theoryI
社団法人日本物理学会の論文
1992-04-15