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Proceedings Paper

Far-infrared absorption by glass-like features in fluorite mixed crystals
Author(s): A. J. Sievers; S. A. FitzGerald; J. A. Campbell
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Paper Abstract

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.

Paper Details

Date Published: 18 December 1996
PDF: 9 pages
Proc. SPIE 2842, Millimeter and Submillimeter Waves and Applications III, (18 December 1996); doi: 10.1117/12.262754
Show Author Affiliations
A. J. Sievers, Cornell Univ. (United States)
S. A. FitzGerald, Cornell Univ. (United States)
J. A. Campbell, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 2842:
Millimeter and Submillimeter Waves and Applications III
Mohammed N. Afsar, Editor(s)

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