Investigating metastable hcp solid helium below its melting pressure

Details Investigating metastable hcp solid helium below its melting pressure Investigating metastable hcp solid helium below its melting pressure

2010-11-10

arxiv.org/abs/1011.2297v1

Journal of Low Temperature Physics (2010) online

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1007/s10909-010-0256-6

We report a first attempt to produce metastable hcp solid helium below its melting pressure. A focused sound pulse is emitted along the c-axis of a mono-domain hcp helium-4 crystal starting from a static pressure just above the melting pressure. The sound pulse is made as simple as possible with one negative and one positive swing only. Density at focus is monitored by an optical interferometric method. Performed numerical simulations show that the crystal anisotropy splits the focused wave into two separate pulses, corresponding to a longitudinal wave along the c-axis and a radial one perpendicular to it. The amplification factor due to focusing remains nevertheless important. Negative pressure swings up to 0.9 bar have been produced, crossing the static melting pressure limit. Improvements in the detection method and in the focusing amplification are proposed.

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