Europhys. Lett, 34 (1), pp. 37-42 (1996)
Low-temperature anomalies in the dissipation of small mechanical resonators
D. S. Greywall, B. Yurke, P. A. Busch and S. C. Arney
AT&T Bell Laboratories - 600 Mountain Avenue, Murray Hill, NJ 07974, USA
(received 16 November 1995; accepted 15 February 1996)
PACS. 62.40+i - Anelasticity, internal friction, stress relaxation, and
PACS. 62.65+k - Acoustical properties of solids.
PACS. 72.55+s - Magnetoacoustic effects.
Abstract:At very low temperatures the dissipation of a mechanical resonator is normally expected to be featureless and to vary slowly with temperature. Here we report measurements made at low-mK temperatures using a simple single-crystal silicon beam with a smallest dimension of 2.5 . Contrary to results obtained on larger resonators these data show a series of dissipation peaks which grow in magnitude with decreasing temperature. One sample exhibited five distinct peaks with equal spacings of 7.7 mK.
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