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Title: Tunneling states in vitreous GeO2
Authors: Laermans, C
Keppens, Veerle
Weeks, R #
Issue Date: Feb-1997
Publisher: American physical soc
Series Title: Physical review b vol:55 issue:5 pages:2701-2704
Abstract: Ultrasonic measurements of the attenuation and the velocity variation have been carried out in amorphous GeO2 at low temperature (0.3-10 K) and high frequencies (80-210 MHz). From numerical fits to the tunneling model, the typical parameters of the tunneling states (TS) were determined and compared to those found for vitreous SiO2. Tne study reveals that in a-GeO2, which is considered as a close structural analog to a-SiO2, although the density of states is found to be very similar in both materials, the coupling between the TS and the phonons is significantly smaller. In the model of coupled tetrahedra as the origin of the TS, this difference can be understood in view of the fact that numerical calculations about the vibrational characteristics of network amorphous solids indicate that the tetrahedra are more decoupled in vitreous GeO2 than in vitreous silica.
ISSN: 0163-1829
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Semiconductor Physics Section
# (joint) last author

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