Pseudo-contact angle due to superfluid vortices in He-4

Authors
Luusalo, R Husmann, A Kopu, J Hakonen, PJ
Citation
R. Luusalo et al., Pseudo-contact angle due to superfluid vortices in He-4, EUROPH LETT, 50(2), 2000, pp. 222-228
Citations number
18
Categorie Soggetti
Physics
Journal title
EUROPHYSICS LETTERS
ISSN journal
02955075 → ACNP
Volume
50
Issue
2
Year of publication
2000
Pages
222 - 228
Database
ISI
SICI code
0295-5075(200004)50:2<222:PADTSV>2.0.ZU;2-A
Abstract
We have investigated spreading of superfluid He-4 on top of polished MgF2 a nd evaporated SiO2 substrates. Our results show strongly varying contact an gles of 0-15 mrad on the evaporated layers. According to our theoretical ca lculations, these contact angles can be explained by a spatially varying di stribution of vortex lines, the unpinning velocity of which is inversely pr oportional to the liquid depth.