Ultrasound study of the solid-liquid transition and solid-liquid interface of $^4$He in aerogels

Details Ultrasound study of the solid-liquid transition and solid-liquid interface of $^4$He in aerogels Ultrasound study of the solid-liquid transition and solid-liquid interface of $^4$He in aerogels

2008-06-24

arxiv.org/abs/0806.3816v2

J. Phys. Soc. Jpn. 78 (2009) 034601

Physics

Condensed Matter

Other Condensed Matter

7 pages, 4 figures

Scientific paper

10.1143/JPSJ.78.034601

The freezing and melting of $^{4}$He in various aerogels with porosities ranging from 92 to 97% was studied using longitudinal ultrasound. The freezing pressure, detected by a change in velocity and attenuation, was elevated from that of bulk by about 0.3 MPa, and showed little dependence on aerogel porosity. We report measurements of the transmission of sound through the solid-liquid interface in aerogel, for the first time, which was independent of temperature and unaffected by a small addition of $^3$He, unlike the bulk interface. This indicates that crystal growth was suppressed by disorder, originating from silica strands. However, small amounts of $^3$He in the solid significantly decreased the attenuation, because the resultant pinning of dislocations by $^3$He suppressed phonon scattering, as is observed in bulk solid $^4$He.

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