Regensburg 2007 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Poster II
DY 30.38: Poster
Donnerstag, 29. März 2007, 16:00–18:00, Poster D
Finite-size effects and universality in superfluid films — •Anna Maciolek1,2,3 and Siegfried Dietrich1,2 — 1Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, D-70569 Stuttgart, Germany — 2Institut für Theoretische und Angewandte Physik, Universität Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart, Germany — 3Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, PL-01-224 Warsaw, Poland
Universal aspects and finite-size scaling of the critical Casimir force fC and specific heat in wetting films of 3He-4He mixtures near their bulk tricritical point and of pure 4He near λ transition are studied within models of corresponding universality class. For mixtures nonsymmetric boundary conditions impose nontrivial concentration profiles leading to the repulsive force which exhibit a rich crossover behavior between the tricritical point and the line of critical points. The theoretical results agree with published experimental data; for mixtures they emphasize the importance of logarithmic corrections to the scaling function.
1 A. Maciolek and S. Dietrich, Europhys. Lett. 74, 22 (2006).
2 A. Maciolek and S. Dietrich, unpublished.