Novel sound phenomena in superfluid helium in aerogel and other impure superfluids

Peter Brusov, Paul Brusov, Gavin Lawes, Jeevak Parpia, Chong Lee, Akira Matsubara, Osamu Ishikawa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Impure superfluids exhibit very unusual properties including unexpected acoustic features. We calculate the coupling between temperature and pressure oscillations for impure superfluids and for superfluid He in aerogel and show that the coupling between first and second sound modes is governed either by c∂ρ/∂c (c is impurity concentration) or by σρaρs (ρa is aerogel density), rather than by the thermal expansion coefficient ∂ρ/∂T, which is enormously small in pure superfluids. This replacement plays a fundamental role in sound phenomena. It leads to the existence of such phenomena as the slow 'pressure' waves and fast 'temperature' waves and modifies significantly all sound conversion phenomena.
LanguageEnglish
Pages329-333
Number of pages5
JournalPhysica B: Condensed Matter
Volume329-333
Issue number1
DOIs
Publication statusPublished - May 2003

Fingerprint

Superfluid helium
Aerogels
aerogels
helium
Acoustic waves
acoustics
pressure oscillations
Thermal expansion
Acoustics
elastic waves
Impurities
thermal expansion
Temperature
impurities
oscillations
temperature
coefficients

Keywords

  • superfluids
  • impurity
  • aerogel
  • sound

Cite this

Brusov, P., Brusov, P., Lawes, G., Parpia, J., Lee, C., Matsubara, A., & Ishikawa, O. (2003). Novel sound phenomena in superfluid helium in aerogel and other impure superfluids. Physica B: Condensed Matter, 329-333(1), 329-333. https://doi.org/10.1016/S0921-4526(02)02075-6
Brusov, Peter ; Brusov, Paul ; Lawes, Gavin ; Parpia, Jeevak ; Lee, Chong ; Matsubara, Akira ; Ishikawa, Osamu. / Novel sound phenomena in superfluid helium in aerogel and other impure superfluids. In: Physica B: Condensed Matter. 2003 ; Vol. 329-333, No. 1. pp. 329-333.
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abstract = "Impure superfluids exhibit very unusual properties including unexpected acoustic features. We calculate the coupling between temperature and pressure oscillations for impure superfluids and for superfluid He in aerogel and show that the coupling between first and second sound modes is governed either by c∂ρ/∂c (c is impurity concentration) or by σρaρs (ρa is aerogel density), rather than by the thermal expansion coefficient ∂ρ/∂T, which is enormously small in pure superfluids. This replacement plays a fundamental role in sound phenomena. It leads to the existence of such phenomena as the slow 'pressure' waves and fast 'temperature' waves and modifies significantly all sound conversion phenomena.",
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Brusov, P, Brusov, P, Lawes, G, Parpia, J, Lee, C, Matsubara, A & Ishikawa, O 2003, 'Novel sound phenomena in superfluid helium in aerogel and other impure superfluids' Physica B: Condensed Matter, vol. 329-333, no. 1, pp. 329-333. https://doi.org/10.1016/S0921-4526(02)02075-6

Novel sound phenomena in superfluid helium in aerogel and other impure superfluids. / Brusov, Peter; Brusov, Paul; Lawes, Gavin; Parpia, Jeevak; Lee, Chong; Matsubara, Akira; Ishikawa, Osamu.

In: Physica B: Condensed Matter, Vol. 329-333, No. 1, 05.2003, p. 329-333.

Research output: Contribution to journalArticle

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AU - Brusov, Peter

AU - Brusov, Paul

AU - Lawes, Gavin

AU - Parpia, Jeevak

AU - Lee, Chong

AU - Matsubara, Akira

AU - Ishikawa, Osamu

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