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, F4s.
Keywords
Cite
@article{arxiv.0806.0908,
title = {High frequency sound in superfluid 3He-B},
author = {J. P. Davis and H. Choi and J. Pollanen and W. P. Halperin},
journal= {arXiv preprint arXiv:0806.0908},
year = {2009}
}
Comments
15 pages, 8 figures, accepted to J. Low Temp. Phys