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.

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

References in corpus (6)

• Tunneling into Current-Carrying Surface States of High T${}_c$ Superconductors
• Discovery of the Acoustic Faraday Effect in Superfluid 3He-B
• Comment on the Coupling of Zero Sound to the $J=1^{-}$ Modes of ${}^3$He-B
• Discovery of an Excited Pair State in Superfluid 3He
• Collective Modes and f-wave Pairing Interactions in Superfluid 3He
• Magneto-Acoustic Spectroscopy in Superfluid 3He-B

Cited by in corpus (5)

• Symmetry Protected Topological Superfluids and Superconductors --- From the Basics to ${}^3$He ---
• Symmetry Protected Topological Superfluid ${}^3$He-B
• Textures of Superfluid 3He-B in Applied Flow and Comparison with Hydrostatic Theory
• Microfluidic and Nanofluidic Cavities for Quantum Fluids Experiments
• Quasiparticle Damping of Surface Waves in Superfluid ${}^3$He and ${}^4$He