Critical casimir force in 4He films: Confirmation of finite-size scaling

A. Ganshin, S. Scheidemantel, R. Garcia, M. H.W. Chan

Research output: Contribution to journalArticle

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Abstract

We present new capacitance measurements of critical Casimir force-induced thinning of 4He films near the superfluid transition, focused on the region below Tλ where the effect is the greatest. 4He films of 238, 285, and 340 Å thickness are adsorbed on atomically smooth, N-doped silicon substrates. The Casimir force scaling function ν, deduced from the thinning of these three films, collapses onto a single universal curve, attaining a minimum ν = -1:30 ± 0:03 at x = td1/ν= - 9:7 ± 0:8 Å 1/ν. The collapse confirms the finite-size scaling origin of the dip in the film thickness. Separately, we also confirm the presence down to 2.13 K of the Goldstone or surface fluctuation force, which makes the superfluid film ∼2 Å thinner than the normal film.

Original languageEnglish (US)
Article number075301
JournalPhysical Review Letters
Volume97
Issue number7
DOIs
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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