Acoustic crystallization and heterogeneous nucleation

Details Acoustic crystallization and heterogeneous nucleation Acoustic crystallization and heterogeneous nucleation

2001-04-12

arxiv.org/abs/cond-mat/0104228v1

Physics

Condensed Matter

Soft Condensed Matter

accepted by Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.5506

By focusing a high intensity acoustic wave in liquid helium, we have observed the nucleation of solid helium inside the wave above a certain threshold in amplitude. The nucleation is a stochastic phenomenon. Its probability increases continuously from 0 to 1 in a narrow pressure interval around Pm + 4.7 bars (Pm is the melting pressure where liquid and solid helium are in equilibrium). This overpressure is larger by two to three orders of magnitude than what had been previously observed. Our result strongly supports a recent suggestion by Balibar, Mizusaki and Sasaki that, in all previous experiments, solid helium nucleated on impurities.

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