Two-Level Systems and Excited-State Transitions in Fluorite Mixed Crystals and Silica Glass
- 5 December 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 73 (23) , 3105-3108
- https://doi.org/10.1103/physrevlett.73.3105
Abstract
Low-temperature far-infrared absorption measurements have been made on a number of alkaline earth: lanthanum fluoride mixed crystals with the fluorite structure. In the mm wave region a continuous distribution of two-level glassy states is identified as being very similar to that previously found for glasses. At shorter wavelengths a characteristic temperature dependence associated with excited state transitions is observed in these mixed crystals. When silica glass is examined with the same precision, similar excited state transitions are found.Keywords
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