Third-sound study of a layered superfluid film

G. Zimmerli, G. Mistura, M. H.W. Chan

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Abstract

Isothermal scans of third-sound velocity as a function of He4 coverage on graphite exhibit pronounced dips integral layer periodicity. The minimum He4 coverage on graphite needed to support third sound is nearly three layers. The heat-capacity isotherm exhibits minima at layer completion but there is no noticeable feature related to the onset of superfluidity. High-resolution adsorption isotherms below 1 K show that He4 film grows layer by layer through at least seven layers.

Original languageEnglish (US)
Pages (from-to)60-63
Number of pages4
JournalPhysical Review Letters
Volume68
Issue number1
DOIs
Publication statusPublished - Jan 1 1992

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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