High frequency sound in superfluid (3)He-B

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We present measurements of the absolute phase velocity of transverse and longitudinal sound in superfluid (3)He-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).
Publisher
SPRINGER/PLENUM PUBLISHERS
Issue Date
2008-10
Language
English
Article Type
Article
Keywords

PAIR-BREAKING EDGE; ZERO-SOUND; COLLECTIVE MODES; MAGNETIC-FIELD; TEMPERATURES; PROPAGATION; DISCOVERY; ENERGY; WAVES

Citation

JOURNAL OF LOW TEMPERATURE PHYSICS, v.153, no.1-2, pp.1 - 14

ISSN
0022-2291
DOI
10.1007/s10909-008-9819-1
URI
http://hdl.handle.net/10203/88810
Appears in Collection
PH-Journal Papers(저널논문)
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