Acoustics of a "Dirty" Fermi Liquid: 3He in Aerogel

G. Gervais; R. Nomura; T. M. Haard; Y. Lee; N. Mulders; W. P. Halperin

doi:10.1023/A:1004816904086

Acoustics of a "Dirty" Fermi Liquid: ³He in Aerogel

G. Gervais^*, R. Nomura, T. M. Haard, Y. Lee, N. Mulders, W. P. Halperin

^*Corresponding author for this work

Physics and Astronomy

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

14 Scopus citations

Abstract

An acoustic cavity containing ³He in 98% porous silica aerogel was used to investigate the effects of impurity scattering in a Fermi liquid. The pressure and temperature dependence of the sound attenuation in the normal Fermi liquid was extracted from the cavity response. The attenuation of sound displays behavior very different from the bulk owing to strong elastic scattering of quasi-particles by the silica strands. Using a visco-elastic model of the Fermi liquid, we find a mean free path restricted to ∼340 nm. Information on the sound velocity is inferred from the pressure dependence of the oscillation period of the cavity response. The data can be accounted for by a Biot model of the ³He liquid in the porous aerogel.

Original language	English (US)
Pages (from-to)	1-10
Number of pages	10
Journal	Journal of Low Temperature Physics
Volume	122
Issue number	1-2
DOIs	https://doi.org/10.1023/A:1004816904086
State	Published - 2001

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

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title = "Acoustics of a {"}Dirty{"} Fermi Liquid: 3He in Aerogel",

abstract = "An acoustic cavity containing 3He in 98% porous silica aerogel was used to investigate the effects of impurity scattering in a Fermi liquid. The pressure and temperature dependence of the sound attenuation in the normal Fermi liquid was extracted from the cavity response. The attenuation of sound displays behavior very different from the bulk owing to strong elastic scattering of quasi-particles by the silica strands. Using a visco-elastic model of the Fermi liquid, we find a mean free path restricted to ∼340 nm. Information on the sound velocity is inferred from the pressure dependence of the oscillation period of the cavity response. The data can be accounted for by a Biot model of the 3He liquid in the porous aerogel.",

author = "G. Gervais and R. Nomura and Haard, {T. M.} and Y. Lee and N. Mulders and Halperin, {W. P.}",

note = "Funding Information: We acknowledge helpful discussions with J. A. Sauls and J. R. Beamish. Work supported by the NSF under grant no. DMR-0072350 and NEDO (Japan). One of the authors (G.G) acknowledges receipt of support from FCAR (Quebec).",

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T2 - 3He in Aerogel

AU - Gervais, G.

AU - Nomura, R.

AU - Haard, T. M.

AU - Lee, Y.

AU - Mulders, N.

AU - Halperin, W. P.

N1 - Funding Information: We acknowledge helpful discussions with J. A. Sauls and J. R. Beamish. Work supported by the NSF under grant no. DMR-0072350 and NEDO (Japan). One of the authors (G.G) acknowledges receipt of support from FCAR (Quebec).

PY - 2001

Y1 - 2001

N2 - An acoustic cavity containing 3He in 98% porous silica aerogel was used to investigate the effects of impurity scattering in a Fermi liquid. The pressure and temperature dependence of the sound attenuation in the normal Fermi liquid was extracted from the cavity response. The attenuation of sound displays behavior very different from the bulk owing to strong elastic scattering of quasi-particles by the silica strands. Using a visco-elastic model of the Fermi liquid, we find a mean free path restricted to ∼340 nm. Information on the sound velocity is inferred from the pressure dependence of the oscillation period of the cavity response. The data can be accounted for by a Biot model of the 3He liquid in the porous aerogel.

AB - An acoustic cavity containing 3He in 98% porous silica aerogel was used to investigate the effects of impurity scattering in a Fermi liquid. The pressure and temperature dependence of the sound attenuation in the normal Fermi liquid was extracted from the cavity response. The attenuation of sound displays behavior very different from the bulk owing to strong elastic scattering of quasi-particles by the silica strands. Using a visco-elastic model of the Fermi liquid, we find a mean free path restricted to ∼340 nm. Information on the sound velocity is inferred from the pressure dependence of the oscillation period of the cavity response. The data can be accounted for by a Biot model of the 3He liquid in the porous aerogel.

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Acoustics of a "Dirty" Fermi Liquid: ³He in Aerogel

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