Journal of Low Temperature Physics

, Volume 148, Issue 5–6, pp 501–505 | Cite as

Imaginary Squashing Mode Spectroscopy of Helium Three B

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

Abstract

We have made precision measurements of the frequency of a collective mode of the superfluid 3He–B order parameter, the J=2 imaginary squashing mode. Measurements were performed at multiple pressures using interference of transverse sound in an acoustic cavity. Transverse waves propagate in the vicinity of this order parameter mode owing to off-resonant coupling. At the crossing of the sound mode and the order parameter mode, the sound wave is strongly attenuated. We use both velocity and attenuation measurements to determine precise values of the mode frequency with a resolution between 0.1% and 0.25%.

PACS

67.57.Jj 67.57.-z 43.20.Ks 43.35.Lq 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

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

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