Journal of Low Temperature Physics

, Volume 102, Issue 1–2, pp 21–29 | Cite as

Spreading of superfluid4He on MgF2

  • H. Alles
  • A. V. Babkin
  • P. J. Hakonen
  • J. P. Ruutu
  • J. T. Salojärvi
  • J. P. Saramäki
Rapid Communication

Abstract

We have investigated the spreading of superfluid4He on top of a polished fused silica plate which is coated by a thin layer of MgF2. Our interferometric experiments indicate that a superfluid4He film of about 100 nm thickness is not able to spread uniformly over a nearly horizontal substrate, and hence these films cannot be governed by the Van der Waals forces only. Even in the stationary state, we observe nonzero (1 – 20 mrad) contact angles which display hysteresis, spatial variation, and strong history dependence.

PACS numbers

67.70.+n 68.45.Gd 

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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • H. Alles
    • 1
  • A. V. Babkin
    • 1
  • P. J. Hakonen
    • 1
  • J. P. Ruutu
    • 1
  • J. T. Salojärvi
    • 1
  • J. P. Saramäki
    • 1
  1. 1.Low Temperature LaboratoryHelsinki University of TechnologyEspooFinland

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