High frequency sound in superfluid 3He-B

Details High frequency sound in superfluid 3He-B High frequency sound in superfluid 3He-B

2008-06-05

arxiv.org/abs/0806.0908v2

Journal of Low Temperature Physics, Volume 153, Numbers 1-2 / October, 2008

Physics

Condensed Matter

Superconductivity

15 pages, 8 figures, accepted to J. Low Temp. Phys

Scientific paper

10.1007/s10909-008-9819-1

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.

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