Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-03-11
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, two figures, one table, two-column format. Related papers can be found at http://nano.bu.edu/
Scientific paper
10.1103/PhysRevB.79.125424
We report kelvin to millikelvin-temperature measurements of dissipation and frequency shift in megahertz-range resonators fabricated from ultra-nanocrystalline diamond. Frequency shift $\delta f/f_0$ and dissipation $Q^{-1}$ demonstrate temperature dependence in the millikelvin range similar to that predicted by the glass model of tunneling two level systems. The logarithmic temperature dependence of $\delta f/ f_0$ is in good agreement with such models, which include phonon relaxation and phonon resonant absorption. Dissipation shows a weak power law, $Q^{-1}\propto T^{{1/3}}$, followed by saturation at low temperature. A comparison of both the scaled frequency shift and dissipation in equivalent micromechanical structures made of single-crystal silicon and gallium arsenide indicates universality in the dynamical response.
Imboden Matthias
Mohanty Pritiraj
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