Second and fourth sound modes for superfluid helium in aerogel

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

Research output: Contribution to journalArticle

9 Citations (Scopus)

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 - Jan 1 1990

Fingerprint

Superfluid helium
Aerogels
aerogels
helium
Acoustic waves
acoustics
sound propagation
oscillators
specific heat
porosity
Specific heat
Porous materials
fluids
Porosity
Fluids

All Science Journal Classification (ASJC) codes

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

Cite this

McKenna, M. J. ; Slawecki, Tania Maria ; Maynard, J. D. / Second and fourth sound modes for superfluid helium in aerogel. In: Physica B: Physics of Condensed Matter. 1990 ; Vol. 165-166, No. PART 1. pp. 581-582.
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Second and fourth sound modes for superfluid helium in aerogel. / McKenna, M. J.; Slawecki, Tania Maria; Maynard, J. D.

In: Physica B: Physics of Condensed Matter, Vol. 165-166, No. PART 1, 01.01.1990, p. 581-582.

Research output: Contribution to journalArticle

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