Observation of metastable hcp solid helium

Details Observation of metastable hcp solid helium Observation of metastable hcp solid helium

2011-06-09

arxiv.org/abs/1106.1877v2

Physics

Condensed Matter

Materials Science

deuxi\`eme version

Scientific paper

We have produced and observed metastable solid helium-4 below its melting pressure between 1.1 K and 1.4 K. This is achieved by an intense pressure wave carefully focused inside a crystal of known orientation. An accurate density map of the focal zone is provided by an optical interferometric technique. Depending on the sample, minimum density achieved at focus corresponds to pressures between 2 and 4 bar below the static melting pressure. Beyond, the crystal undergoes an unexpected instability much earlier than the predicted spinodal limit. This opens a novel opportunity to study this quantum crystal in an expanded metastable state and its stability limits.

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