No effect of steady rotation on solid 4He in a torsional oscillator

Fear, Matthew and Walmsley, Paul and Zmeev, Dmitriy and Makinen, J.T. and Golov, A. (2016) No effect of steady rotation on solid 4He in a torsional oscillator. Journal of Low Temperature Physics, 183 (3-4). pp. 106-112. ISSN 0022-2291

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We have measured the response of a torsional oscillator containing polycrystalline hcp solid 4He to applied steady rotation in an attempt to verify the observations of several other groups that were initially interpreted as evidence for macroscopic quantum effects. The geometry of the cell was that of a simple annulus, with a fill line of relatively narrow diameter in the centre of the torsion rod. Varying the angular velocity of rotation up to 2 rad s-1 showed that there were no step-like features in the resonant frequency or dissipation of the oscillator and no history dependence, even though we achieved the sensitivity required to detect the various effects seen in earlier experiments on other rotating cryostats. All small changes during rotation were consistent with those occurring with an empty cell. We thus observed no effects on the samples of solid 4He attributable to steady rotation.

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Journal Article
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Journal of Low Temperature Physics
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17 May 2016 15:50
Last Modified:
22 Nov 2022 03:15