High Frequency Sound in Superfluid 3He-B |
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Authors: | J. P. Davis H. Choi J. Pollanen W. P. Halperin |
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Affiliation: | 1. Department of Physics and Astronomy, Northwestern University, Evanston, IL, 60208, USA 2. Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2G7, Canada
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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 . |
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