Abstract
The equation of motion for the random walk of single particles in an amorphous matrix and the vibrational equation of motion in amorphous solids can be mathematically mapped onto each other by replacing the first time derivative by the second one. Comparing experimental data with results of the effective medium theory we show that disorder leads to anomalous diffusion which extends into the millisecond regime if the temperature is low enough. In the analogous vibrational problem this corresponds to the occurrence of anomalous sound propagation, which leads to anomalies in the phonon density of states and an anomalous temperature dependence of the specific heat capacity.
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Schirmacher, W., Wagener, M. (1991). Anomalous diffusion and anomalous sound propagation in amorphous solids. In: Rössler, U. (eds) Festkörperprobleme 31. Advances in Solid State Physics, vol 31. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0107858
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