Dynamics of incommensurate structures and inelastic neutron scattering (original) (raw)

Physical Review B, 1989

Abstract

A general analysis of the dynamics of displacive incommensurately modulated structures within the harmonic approximation is presented. Superspace formalism is not used. The present approach is compared with the usual Landau model and some recent phenomenological predictions for hard internal modes. The characteristics of coherent inelastic neutron scattering are also analyzed. A compact expression for the one-phonon dynamic structure factor

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