18 December 1996 Far-infrared absorption by glass-like features in fluorite mixed crystals
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The mm- and submillimeter wave spectrum of a glass at low temperatures is often dominated by the dynamics of two level systems (TLS). These E and M properties are reviewed here. Next the low-temperature far-IR absorption measurements on a number of alkaline earth: rare earth fluoride mixed crystals with the fluorite structure are described, compared to the glass results, and found to display a similar frequency distribution of TLS. At higher far IR frequencies a characteristic temperature dependence associated with excited state transitions of the TLS is observed for both mixed crystals and glasses, suggesting a fundamental connection between the TLS in these very different systems.
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A. J. Sievers, A. J. Sievers, S. A. FitzGerald, S. A. FitzGerald, J. A. Campbell, J. A. Campbell, } "Far-infrared absorption by glass-like features in fluorite mixed crystals", Proc. SPIE 2842, Millimeter and Submillimeter Waves and Applications III, (18 December 1996); doi: 10.1117/12.262754; https://doi.org/10.1117/12.262754

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