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

R. Luusalo, A. Husmann, J. Kopu +1

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 mra…