Quasielastic light scattering in the one-dimensional superionic conductor hollandites

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Abstract
The wave-vector, polarization, and temperature dependencies of the quasielastic light scattering (QELS) have been studied in the one-dimensional superionic conductor K and Cs hollandite crystals. Based on the wave-vector and the temperature dependencies, the origin of the QELS has been attributed to ionic hopping in a one-dimensional tunnel. The polarization characteristics of the QELS for the K hollandite can be well explained by the ‘‘pair diffusion model’’ applied to a one dimensional ion hopping process. The temperature dependence of the QELS intensity is found to depend drastically on the ionic species. This is well explained in terms of the extended ‘‘pair diffusion model,’’ in which the distribution of activation energy for ion hopping is introduced.