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

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<mark>Journal publication date</mark>05/2016
<mark>Journal</mark>Journal of Low Temperature Physics
Issue number3-4
Volume183
Number of pages7
Pages (from-to)106-112
Publication StatusPublished
Early online date9/12/15
<mark>Original language</mark>English

Abstract

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.