High Frequency Sound in Superfluid 3He-B

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 s4 .

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Correspondence to J. P. Davis.

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Davis, J.P., Choi, H., Pollanen, J. et al. High Frequency Sound in Superfluid 3He-B. J Low Temp Phys 153, 1–14 (2008). https://doi.org/10.1007/s10909-008-9819-1

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Keywords

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

PACS

  • 67.30.H-
  • 74.20.Rp
  • 74.25.Ld
  • 43.35.Lq