Journal of Low Temperature Physics

, Volume 153, Issue 1–2, pp 1–14 | Cite as

High Frequency Sound in Superfluid 3He-B

  • J. P. Davis
  • H. Choi
  • J. Pollanen
  • W. P. Halperin
Article

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, F4s.

Keywords

Superfluid Helium Collective mode Pair-breaking Transverse sound Longitudinal sound 

PACS

67.30.H- 74.20.Rp 74.25.Ld 43.35.Lq 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • J. P. Davis
    • 1
    • 2
  • H. Choi
    • 1
  • J. Pollanen
    • 1
  • W. P. Halperin
    • 1
  1. 1.Department of Physics and AstronomyNorthwestern UniversityEvanstonUSA
  2. 2.Department of PhysicsUniversity of AlbertaEdmontonCanada

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