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Slowly relaxing tunneling states in neutron-irradiated quartz: A study of the internal friction at audio-frequencies |
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| Authors: | A. Vanelstraete C. Laermans L. Lejarraga M. von Schickfus S. Hunklinger |
| Affiliation: | (1) Department of Physics, Katholieke Universiteit Leuven, B-3030 Leuven, Belgium;(2) Institut für Angewandte Physik II, Universität Heidelberg, Albert-Ueberle-Strasse 3-5, D-6900 Heidelberg, Federal Republic of Germany |
| Abstract: | The internal friction of two neutron-irradiated quartz samples was measured at audio-frequency as a function of temperature. This is an extension of acoustic measurements to much lower frequencies and thus to much longer time scales. A temperature independent behaviour has been observed and is discussed in the framework of the  tunnelling model . One of the major assumptions of this model regarding the tunnelling states with long relaxation time could be verified for neutron-irradiated quartz. |
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