Second and fourth sound modes for superfluid helium in aerogel

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

doi:10.1016/S0921-4526(90)81140-J

Second and fourth sound modes for superfluid helium in aerogel

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

Materials Research Institute (MRI)

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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 T_c . 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 T_c.

Original language	English (US)
Pages (from-to)	581-582
Number of pages	2
Journal	Physica B: Physics of Condensed Matter
Volume	165-166
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4526(90)81140-J
State	Published - Aug 1990

All Science Journal Classification (ASJC) codes

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

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10.1016/S0921-4526(90)81140-J

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title = "Second and fourth sound modes for superfluid helium in aerogel",

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.",

author = "McKenna, {M. J.} and Slawecki, {Tania M.} and Maynard, {J. D.}",

note = "Funding Information: +Work supported by NSF DMR 8701682.",

year = "1990",

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doi = "10.1016/S0921-4526(90)81140-J",

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T1 - Second and fourth sound modes for superfluid helium in aerogel

AU - McKenna, M. J.

AU - Slawecki, Tania M.

AU - Maynard, J. D.

N1 - Funding Information: +Work supported by NSF DMR 8701682.

PY - 1990/8

Y1 - 1990/8

N2 - 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.

AB - 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.

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JO - Physica B: Physics of Condensed Matter

JF - Physica B: Physics of Condensed Matter

IS - PART 1

ER -

Second and fourth sound modes for superfluid helium in aerogel

Abstract

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