Anderson localization in crystals with heavy isotopic impurities
Polishchuk I. Ya., Burin A. L. , Maksimov L. A.
The vibration spectrum of a harmonic crystal with heavy impurities is shown to consist of two branches, separated by a gap. Bordering the gap on each branch is a frequency interval corresponding to localized modes. The localization thresholds, the frequency dependence of the diffusion coefficient, and that of the phonon localization radius are all derived.