4He Films on Graphite Studied by Neutron Scattering

  • H. J. Lauter
  • H. Godfrin
  • V. L. P. Frank
  • P. Leiderer
Part of the NATO ASI Series book series (NSSB, volume 257)


A 4He film shows particular properties. For example the superfluid onset temperature is shifted to lower temperatures with decreasing film thickness and a reduced superfluid fraction is detected [1–3]. This may be caused by a different excitation spectrum with respect to the bulk [e.g. 3]. In addition a 4He film has two interfaces the gas-liquid boundary and the liquid-solid boundary. At the gas-liquid boundary quantized capillary waves (ripplons) [4–7] can be excited. Concerning the liquid-solid boundary it was measured that if the film is deposited on a graphite substrate, that the two layers adjacent to the graphite are solid [8]. The interesting interface is thus the liquid-solid 4He interface. Here the freezing-melting wave could be excited [9]. In addition this interface could play a role in the anomalous small Kapitza-resistance. In this report we will give some new information about excitations in a 4He film and at its boundaries.


Dispersion Curve Capillary Wave Bulk Data Flat Mode Decrease Film Thickness 
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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • H. J. Lauter
    • 1
  • H. Godfrin
    • 1
  • V. L. P. Frank
    • 1
    • 2
  • P. Leiderer
    • 2
  1. 1.Institute Laue-LangevinGrenobleFrance
  2. 2.University of KonstanzKonstanzWest Germany

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