Critical Casimir Effect in 3He-4He films

Details Critical Casimir Effect in 3He-4He films Critical Casimir Effect in 3He-4He films

2005-06-20

arxiv.org/abs/cond-mat/0506519v1

Physics

Condensed Matter

Statistical Mechanics

12 pages, 4 figures, submitted to the Phys. Rev. Lett

Scientific paper

10.1209/epl/i2005-10497-y

Universal aspects of the thermodynamic Casimir effect in wetting films of 3He-4He mixtures near their bulk tricritical point are studied within suitable models serving as representatives of the corresponding universality class. The effective forces between the boundaries of such films arising from the confinement are calculated along isotherms at several fixed concentrations of 3He. Nonsymmetric boundary conditions impose nontrivial concentration profiles leading to repulsive Casimir forces which exhibit a rich behavior of the crossover between the tricritical point and the line of critical points. The theoretical results agree with published experimental data and emphasize the importance of logarithmic corrections.

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