High frequency sound in superfluid 3He-B

J. P. Davis*, H. Choi, J. Pollanen, William P Halperin

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We present measurements of the absolute phase velocity of transverse and longitudinal sound in superfluid 3He-B at low temperature, extending from the imaginary squashing mode to near pair-breaking. Changes in the transverse phase velocity near pair-breaking have been explained in terms of an order parameter collective mode that arises from f -wave pairing interactions, the so-called J =4 - mode. Using these measurements, we establish lower bounds on the energy gap in the B-phase. Measurement of attenuation of longitudinal sound at low temperature and energies far above the pair-breaking threshold, are in agreement with the lower bounds set on pair-breaking. Finally, we discuss our estimations for the strength of the f -wave pairing interactions and the Fermi liquid parameter, F 4 s.

Original languageEnglish (US)
Pages (from-to)1-14
Number of pages14
JournalJournal of Low Temperature Physics
Volume153
Issue number1-2
DOIs
StatePublished - Oct 1 2008

Keywords

  • Collective mode
  • Helium
  • Longitudinal sound
  • Pair-breaking
  • Superfluid
  • Transverse sound

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)

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