Second and fourth sound modes for superfluid helium in aerogel

M. J. McKenna, Tania M. Slawecki, J. D. Maynard

Research output: Contribution to journalArticle

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Abstract

Because of the interest in superfluid onset in porous media (high porosity aerogel in particular) one would like to measure the superfluid fraction as well as the heat capacity near Tc . However, standard techniques such as torsional oscillators and fourth sound have encountered difficulties because the compliant aerogel allows the viscous normal fluid to move. Using data we obtained for fourth sound propagation below 1.8 K, we develop a theory which fits the data with no adjustible parameters, and show that the theory predicts another second-sound-like mode which may not be damped near Tc.

Original languageEnglish (US)
Pages (from-to)581-582
Number of pages2
JournalPhysica B: Physics of Condensed Matter
Volume165-166
Issue numberPART 1
DOIs
StatePublished - Aug 1990

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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