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1971•Physical Review LettersRequires access

High-Frequency Ultrasonic Attenuation in Superfluid Helium Under Pressure

J. Jäckle, K. W. Kehr

Open publisher page 66 citations

Abstract

We attribute the formation of a shoulder in the high-frequency ultrasonic attenuation in superfluid helium under pressure to a restriction on the three-phonon process with thermal phonons. The restriction is proposed to follow from the pressure dependence of the phonon dispersion at zero temperature. The steep rise above the shoulder due to phonon-roton and roton-roton interactions also indicates large dispersion effects under pressure.

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What this paper is about

We attribute the formation of a shoulder in the high-frequency ultrasonic attenuation in superfluid helium under pressure to a restriction on the three-phonon process with thermal phonons. The restriction is proposed to follow from the pressure dependence of the phonon dispersion at zero temperature. The steep rise above the shoulder due to phonon-roton and roton-roton interactions also indicates large dispersion effects under pressure.

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OpenAlex reports 66 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

We attribute the formation of a shoulder in the high-frequency ultrasonic attenuation in superfluid helium under pressure to a restriction on the three-phonon process with thermal phonons. The restriction is proposed to follow from the pressure dependence of the phonon dispersion at zero temperature. The steep rise above the shoulder due to phonon-roton and roton-roton interactions also indicates large dispersion effects under pressure.

Key concepts: Roton, Superfluid helium-4, Phonon, Attenuation, Condensed matter physics, Superfluidity, Dispersion (optics), Helium

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