Mass Transport of 4He Films Adsorbed on Graphite
Thin 4He films adsorbed on various substrates have superfluid onset temperatures T 0 which vary with film thickness (or relative pressure P/ P 0) in a regular manner, so that results of a large number of different studies fall on a common curve of T 0 vs. P/P 0.1–3 Because of this it has been felt that the understanding of onset phenomena need not include details of the substrate interaction (or at least that all substrates can be considered identical.4 Recently some experiments5–8 using different substrates have yielded slightly higher T 0 values, suggesting that superflow onset is substrate influenced in multilayer films. This conjecture is supported by our current studies of flow on graphite, which, according to recent heat capacity data,9–11 is a manifestly more uniform surface. We report here a complex of “onset” phenomena which have not been seen in films on typical substrates.
KeywordsBasal Plane Multilayer Film Graphite Surface Common Curve Exit Chamber
Unable to display preview. Download preview PDF.
- 2.R.P. Henkel, G. Kukich, and J.D. Reppy, in Proc. 11th Intern. Conf. Low Temp. Phys., 1968, St. Andrews Univ. Press, Scotland (1969).Google Scholar
- 3.K.R. Atkins and I. Rudnick, Progress in Low Temperature Physics,C.J. Gorter, ed. North-Holland, Amsterdam (1970), Vol. 6.Google Scholar
- 8.H.W. Chan, A.W. Yanof, F.D.M. Pobell, and J.D. Reppy, this volume.Google Scholar
- 13.A. Thorny and X. Duval, J. Chim. Phys. (Paris) 66, 1966 (1969); 67, 286, 1101 (1970).Google Scholar