Observation of a second-sound-like mode in superfluid-filled aerogel

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

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Superfluid He4 is interesting acoustically because it can support more than one mode of sound propagation, and these can be used to study critical properties. Recently, there has been interest in superfluid-filled aerogels, but for such compressible materials one does not observe the ordinary (fourth) sound; instead there is a mode intermediate between first and fourth sound and a second-sound-like mode. We present a theory for the modes and the first observation of the aerogel second-sound-like mode, which is important because it propagates near the critical temperature.

Original languageEnglish (US)
Pages (from-to)1878-1881
Number of pages4
JournalPhysical Review Letters
Issue number14
Publication statusPublished - Jan 1 1991


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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