Abstract
The internal friction Q −1 and the sound velocity δv/v of vitreous silica were measured at temperatures between 6 mK and 40 K using mechanical double paddle resonators. This experimental technique allows measurements to be performed at different frequencies (0.33 to 14 kHz) and with very small background loss. Above ∼ 50 mK the elastic properties can be described by the tunneling model with overall good agreement, provided that at temperatures above 5 K allowance is made for thermally activated relaxation processes. In contrast, at very low temperatures both internal friction and sound velocity deviate substantially from the predictions of the tunneling model. The results clearly indicate the relevance of mutual interaction between tunneling states in the Millikelvin temperature range but a satisfactory quantitative understanding of the observed phenomena is still lacking.
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This paper is dedicated to Prof. F. Wegner on occasion of his 60th birthday.
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© 2000 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH
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Classen, J., Burkert, T., Enss, C., Hunklinger, S. (2000). Beyond the tunneling model—Elastic properties of vitreous silica at low temperatures. In: Kramer, B. (eds) Advances in Solid State Physics 40. Advances in Solid State Physics, vol 40. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0108360
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