Abstract
We have used an acoustic technique to pressurize liquid helium 4 up to 163 ± 20 bar. This is far above the liquid–solid equilibrium pressure Pm, which is 25.3 bar in the low, temperature domain, where the experiment was performed (0.05 K < T < 1 K). This is also far above 65 bar, the prediction of the standard theory for homogeneous nucleation of solid helium. However, no solidification was observed. We discuss our experimental method and the metastability of liquid helium at such very large overpressures. We also propose improvements of our experiment, in order to reach a possible instability limit of liquid helium 4 around 200 bar.
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