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The thermodynamic Casimir effect in the neighbourhood of the lambda-transition: A Monte Carlo study of an improved three dimensional lattice model

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arxiv 0905.2096 v1 pith:HYCCDHGB submitted 2009-05-13 cond-mat.stat-mech

classification cond-mat.stat-mech
keywords carlomontecasimirfilmsfinitelatticemodelresults
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We study the thermodynamic Casimir effect in thin films in the three dimensional XY universality class. To this end, we simulate the improved two component phi^4 model on the simple cubic lattice. We use lattices up to the thickness L_0=33. Based on the results of our Monte Carlo simulations we compute the universal finite size scaling function theta that characterizes the behaviour of the thermodynamic Casimir force in the neighbourhood of the critical point. We confirm that leading corrections to the universal finite size scaling behaviour due to free boundary conditions can be expressed by an effective thickness L_{0,eff} = L_0+ L_s, with L_s =1.02(7). Our results are compared with experiments on films of 4He near the lambda-transition, previous Monte Carlo simulations of the XY model on the simple cubic lattice and field-theoretic results. Our result for the finite size scaling function theta is essentially consistent with the experiments on films of 4He and the previous Monte Carlo simulations.

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