Temperature and Frequency Dependence of Longitudinal Sound in HCP 4He

  • I. D. Calder
  • J. P. Franck


We present here data on the temperature- and frequency-dependence of the longitudinal sound velocity of single crystals of hcp 4He. The data show the following: the longitudinal sound velocity has very large dispersion at all temperatures from the melting point on down; the anomalous behavior is not always present; in crystals that show an anomaly (the majority of those grown), the anomaly moves to lower temperatures with increasing frequency.


Phase Velocity Sound Velocity Anomalous Behavior Orientation Dependence Anomalous Dispersion 
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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • I. D. Calder
    • 1
  • J. P. Franck
    • 1
  1. 1.Department of PhysicsUniversity of AlbertaEdmontonCanada

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