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Critical Casimir effect in superfluid wetting films.
Phys Rev E Stat Nonlin Soft Matter Phys
September 2007
Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, D-70569 Stuttgart, Germany.
Recent experimental data for the complete wetting behavior of pure 4He and of 3He-4He mixtures exposed to solid substrates show that there is a change of the corresponding film thicknesses L upon approaching thermodynamically the lambda transition and the tricritical end point, respectively, which can be attributed to critical Casimir forces fC. We calculate the scaling functions theta of fC within models representing the corresponding universality classes. For the mixtures our analysis provides an understanding of the rich behavior of theta deduced from the experimental data and predicts the crossover behavior between the tricritical point and the lambda transition of pure 4He which are connected by a line of critical points.
View Article and Find Full Text PDFCritical casimir effect and wetting by helium mixtures.
Phys Rev Lett
March 2003
Laboratoire de Physique Statistique de l'Ecole Normale Supérieure, associé aux Universités Paris 6 et Paris 7 et au CNRS, 24 rue Lhomond 75231 Paris Cedex 05, France.
We have measured the contact angle of the interface of phase-separated 3He-4He mixtures against a sapphire window. We have found that this angle is finite and does not tend to zero when the temperature approaches T(t), the temperature of the tricritical point. On the contrary, it increases with temperature.
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