Sound Modes of Superfluid 3He in Aerogel

D. A. Geller; A. Golov; N. Mulders; M. H.W. Chan; J. M. Parpia

doi:10.1023/a:1022563019975

Sound Modes of Superfluid ³He in Aerogel

D. A. Geller, A. Golov, N. Mulders, M. H.W. Chan, J. M. Parpia

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7 Scopus citations

Abstract

We present the results of experiments on sound propagation at audio frequencies in ³He-filled aerogel. Sound modes were observed at temperatures of 0.8-100 mK in an aerogel sample of 98% porosity. We find that below Tc for superfluid ³He in the aerogel matrix the speed of sound in the composite system increases by as much as 1.5%. Also below the aerogel T_c new modes appear which correspond to propagation speeds of up to ∼10 m/s.

Original language	English (US)
Pages (from-to)	339-344
Number of pages	6
Journal	Journal of Low Temperature Physics
Volume	113
Issue number	3-4
DOIs	https://doi.org/10.1023/a:1022563019975
State	Published - Jan 1 1998

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics
General Materials Science
Condensed Matter Physics

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abstract = "We present the results of experiments on sound propagation at audio frequencies in 3He-filled aerogel. Sound modes were observed at temperatures of 0.8-100 mK in an aerogel sample of 98\% porosity. We find that below Tc for superfluid 3He in the aerogel matrix the speed of sound in the composite system increases by as much as 1.5\%. Also below the aerogel Tc new modes appear which correspond to propagation speeds of up to ∼10 m/s.",

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AU - Golov, A.

AU - Mulders, N.

AU - Chan, M. H.W.

AU - Parpia, J. M.

PY - 1998/1/1

Y1 - 1998/1/1

N2 - We present the results of experiments on sound propagation at audio frequencies in 3He-filled aerogel. Sound modes were observed at temperatures of 0.8-100 mK in an aerogel sample of 98% porosity. We find that below Tc for superfluid 3He in the aerogel matrix the speed of sound in the composite system increases by as much as 1.5%. Also below the aerogel Tc new modes appear which correspond to propagation speeds of up to ∼10 m/s.

AB - We present the results of experiments on sound propagation at audio frequencies in 3He-filled aerogel. Sound modes were observed at temperatures of 0.8-100 mK in an aerogel sample of 98% porosity. We find that below Tc for superfluid 3He in the aerogel matrix the speed of sound in the composite system increases by as much as 1.5%. Also below the aerogel Tc new modes appear which correspond to propagation speeds of up to ∼10 m/s.

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Sound Modes of Superfluid ³He in Aerogel

Abstract

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