Two-level systems and excited-state transitions in fluorite mixed crystals and silica glass
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.
Repository Citation
FitzGerald, S.A., J.A. Campbell, and A.J. Sievers. 1994. "Two-level systems and excited-state transitions in fluorite mixed crystals and silica glass." Physical Review Letters 73(23): 3105-3108.
Publisher
American Physical Society
Publication Date
12-5-1994
Publication Title
Physical Review Letters
Department
Physics and Astronomy
Document Type
Article
DOI
https://dx.doi.org/10.1103/PhysRevLett.73.3105
Language
English
Format
text
