Ahlstrom, Sean and Bradley, Ian and Clovecko, Marcel and Guénault, Tony and Guise, Edward Ashley and Haley, Richard and Kolosov, Oleg and Kumar, Mukesh and McClintock, Peter V. E. and Pickett, George and Polturak, E. and Poole, Malcolm and Todoshchenko, Igor A. and Tsepelin, Viktor and Woods, Andrew (2014) Response of a mechanical oscillator in solid 4He. Journal of Low Temperature Physics, 175 (1-2). pp. 140-146. ISSN 0022-2291
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Abstract
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.