Journal of Low Temperature Physics

, Volume 28, Issue 3–4, pp 369–379 | Cite as

New calculation of the acoustical mismatch in the Kapitza conductance of bulk helium

  • R. Guermeur
  • C. Jacolin
Article

Abstract

Elastic wave transmission at the interface between a substrate and liquid helium has been calculated using a model that takes into account the inhomogeneous character of the acoustical impedance in helium and in particular the existence of a solid helium layer intermediate between the substrate and bulk liquid helium. The properties of this layer (width, velocity, and attenuation of elastic waves) have a great influence on the calculated transmission. A width of about 10 Å seems to fit many quoted experimental results. The Kapitza conductanceh k derived from this model and the temperature variation ofh k agree with experimental results obtained from clean copper samples.

Keywords

Attenuation Helium Great Influence Elastic Wave Layer Intermediate 

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Copyright information

© Plenum Publishing Corporation 1977

Authors and Affiliations

  • R. Guermeur
    • 1
  • C. Jacolin
    • 1
  1. 1.Département d'ElectroniqueUniversité de ProvenceMarseilleFrance

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