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Temperature and Frequency Dependence of Longitudinal Sound in HCP 4He

  • I. D. Calder
  • J. P. Franck

Abstract

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.

Keywords

Phase Velocity Sound Velocity Anomalous Behavior Orientation Dependence Anomalous Dispersion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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