Observation of a high-frequency cutoff for phonon propagation in liquid He4

T. Haavasoja, V. Narayanamurti, M. A. Chin, R. N. Bhatt

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

A new high-frequency cutoff for phonon propagation which lies beyond the well-known low-frequency cutoff due to anomalous dispersion is observed in phonon propagation experiments in liquid He4 using superconducting Sn and A1 tunnel-junction generators and detectors. The cutoff depends strongly on pressure and is interpreted as arising from a strong increase in phase space for phonon-roton scattering as normal dispersion in the phonon branch sets in.

Original languageEnglish (US)
Pages (from-to)2406-2409
Number of pages4
JournalPhysical review letters
Volume51
Issue number26
DOIs
StatePublished - Jan 1 1983
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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