On The Mobile Behavior of Solid $^4$He at High Temperatures

Details On The Mobile Behavior of Solid $^4$He at High Temperatures On The Mobile Behavior of Solid $^4$He at High Temperatures

2011-02-27

arxiv.org/abs/1102.5521v1

Physics

Condensed Matter

Other Condensed Matter

15 pages, 6 figures

Scientific paper

10.1007/s10909-011-0351-3

We report studies of solid helium contained inside a torsional oscillator, at temperatures between 1.07K and 1.87K. We grew single crystals inside the oscillator using commercially pure $^4$He and $^3$He-$^4$He mixtures containing 100 ppm $^3$He. Crystals were grown at constant temperature and pressure on the melting curve. At the end of the growth, the crystals were disordered, following which they partially decoupled from the oscillator. The fraction of the decoupled He mass was temperature and velocity dependent. Around 1K, the decoupled mass fraction for crystals grown from the mixture reached a limiting value of around 35%. In the case of crystals grown using commercially pure $^4$He at temperatures below 1.3K, this fraction was much smaller. This difference could possibly be associated with the roughening transition at the solid-liquid interface.

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