Volume Dependence of the Longitudinal Sound Velocity in hcp ${He}^{4}$ Single Crystals

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23 February 1970

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 24 (8) , 365-367
https://doi.org/10.1103/physrevlett.24.365

Abstract

Measurements of the longitudinal sound velocity

v_{1}

in hcp

{He}^{4}

as a function of direction relative to the hexagonal axis are reported for molar volumes between 20.3 and 17.3

{cm}^{3}

/mole. The variation of

v_{1}

with molar volume is much stronger than predicted by theory. Agreement is found with theoretical predictions for the anisotropy of

v_{1}

.

Keywords

SINGLE CRYSTAL

This publication has 16 references indexed in Scilit:

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