Pseudo-contact angle due to superfluid vortices in $^{4}$He

Details Pseudo-contact angle due to superfluid vortices in $^{4}$He Pseudo-contact angle due to superfluid vortices in $^{4}$He

1999-10-24

arxiv.org/abs/cond-mat/9910379v1

Physics

Condensed Matter

Materials Science

10 pages, 4 figures

Scientific paper

10.1209/epl/i2000-00258-6

We have investigated spreading of superfluid $^{4}$He on top of polished MgF$_2$ and evaporated SiO$_{2}$ substrates. Our results show strongly varying contact angles of 0 - 15 mrad on the evaporated layers. According to our theoretical calculations, these contact angles can be explained by a spatially varying distribution of vortex lines, the unpinning velocity of which is inversely proportional to the liquid depth.

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