Abstract
The 1/f noise behaviour of quartz crystal resonators between liquid helium and room temperature is investigated in relation with acoustic attenuation. Large attenuation is observed at 20 K and 50 K The 50 K is due to ionic Na + impurity relaxation and the 20 K peak to the interaction of the sound wave with thermal phonons. A strong correlation between 1/f noise level and the acoustic attenuation is found. These results support for quartz crystal the hypothesis of the origin of 1/f noise in phonons fluctuations, and principally in the fluctuations of their relaxation time. The relation between 1/f noise and Q-factor follows a 1/Q 4 law as it has already been observed at room temperature with resonators of various frequencies. This correlation is not observed on the Na + impurity relaxation peak. At very low temperature (below 10 K), the attenuation increases again and 1/f noise level follows approximately the same Q-factor dependence.
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