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Research output: Contribution to Journal/Magazine › Journal article › peer-review
| <mark>Journal publication date</mark> | 04/2014 |
|---|---|
| <mark>Journal</mark> | Journal of Low Temperature Physics |
| Issue number | 1-2 |
| Volume | 175 |
| Number of pages | 7 |
| Pages (from-to) | 140-146 |
| Publication Status | Published |
| Early online date | 1/10/13 |
| <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.