Lattice dynamics of KI perturbed by Jahn-Teller centres

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Abstract
The dynamics of a Jahn-Teller (JT) impurity in a non-conducting lattice is here considered. The different contributions to the local change of the lattice force constants induced by a JT impurity are discussed. It is found that the linear electron-phonon JT interaction is responsible for a peculiar term δΛ which is absent for usual impurities. In particular the case of (E-e)-type JT impurity is considered, in the weak perturbation limit ; the effect of δΛ on the E-symmetry perturbed one-phonon density of states ρE(ω) is analysed and ρE(ω) is numerically evaluated, for some model JT impurities in potassium iodide crystals

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