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Response of a mechanical oscillator in solid 4He

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>04/2014
<mark>Journal</mark>Journal of Low Temperature Physics
Issue number1-2
Number of pages7
Pages (from-to)140-146
Early online date1/10/13
<mark>Original language</mark>English


We present the first measurements of the response of a mechanical oscillator in solid 4He. We use a lithium niobate tuning fork operating in its fundamental resonance mode at a frequency of around 30 kHz. Measurements in solid 4He were performed close to the melting pressure. The tuning fork resonance shows substantial frequency shifts on cooling from around 1.5 K to below 10 mK. The response shows an abrupt change at the bcc-hcp transition. At low temperatures, below around 100 mK, the resonance splits into several overlapping resonances.

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