Second-sound attenuation associated with hot ions in liquid he II

L. Bruschi, B. Maraviglia, P. Mazzoldi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

An extra attenuation of a second-sound wave associated with the motion of hot ions in liquid helium II has been investigated in the range of temperatures 0.87-1.40°K. Such an attenuation manifests itself as a threshold phenomenon at a well-defined electric field Eα, which is found to coincide with the critical field EC at which a "persistence" of the drift velocity a;VDa; begins. The existence of a threshold indicates that there is a quite different hydrodynamical regime beyond the threshold. The threshold field has the temperature dependence Eα=Ae-ΔST, with ΔS=7.69±0.13°K. ΔS varies with pressure analogously to the Δ of rotons measured by neutron diffraction. It is found experimentally that the extra attenuation is an effect strictly associated with the ion. The attenuation is not interpretable in terms of the single-vortex-ring models so far existing. Comparisons are made with analogous experiments where the interaction between second-sound waves and vorticity is investigated.

Original languageEnglish
Pages (from-to)84-90
Number of pages7
JournalPhysical Review
Volume143
Issue number1
DOIs
Publication statusPublished - 1966

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attenuation
thresholds
acoustics
liquids
sound waves
ions
rotons
vortex rings
liquid helium
vorticity
neutron diffraction
temperature dependence
electric fields
interactions
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Second-sound attenuation associated with hot ions in liquid he II. / Bruschi, L.; Maraviglia, B.; Mazzoldi, P.

In: Physical Review, Vol. 143, No. 1, 1966, p. 84-90.

Research output: Contribution to journalArticle

Bruschi, L, Maraviglia, B & Mazzoldi, P 1966, 'Second-sound attenuation associated with hot ions in liquid he II', Physical Review, vol. 143, no. 1, pp. 84-90. https://doi.org/10.1103/PhysRev.143.84
Bruschi, L. ; Maraviglia, B. ; Mazzoldi, P. / Second-sound attenuation associated with hot ions in liquid he II. In: Physical Review. 1966 ; Vol. 143, No. 1. pp. 84-90.
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