Acoustic emission in bulk normal and superfluid 3He

Noble, Theo and Midlik, Šimon and Colman, Liam and Schmoranzer, David and Tsepelin, Viktor (2023) Acoustic emission in bulk normal and superfluid 3He. Applied Physics Letters, 122 (16): 163502. ISSN 0003-6951

[thumbnail of APL23-AR-01581]
Text (APL23-AR-01581)
APL23_AR_01581.pdf - Accepted Version
Available under License Creative Commons Attribution.

Download (769kB)

Abstract

We present measurements of the damping experienced by custom-made quartz tuning forks submerged in 3He covering frequencies from 20 kHz to 600 kHz. Measurements were conducted in the bulk of normal liquid 3He at temperatures from 1.5 K down to 12 mK and in superfluid 3He-B well below the critical temperature. The presented results complement earlier work on tuning fork damping in 3He, removing possible ambiguities associated with acoustic emission within partially enclosed volumes and extend the probed range of frequencies, leading to a clearly established frequency dependence of the acoustic losses. Our results validate existing models of damping and point toward the same mechanism of wave emission of first sound in normal 3He and liquid 4He and zero sound in superfluid 3He. We observe a steep frequency dependence of the damping ≈ f5.5, which starts to dominate around 100 kHz and restricts the use of tuning forks as efficient sensors in quantum fluids. The acoustic emission model can predict the limiting frequencies for various devices, including micro-electromechanical and nano-electromechanical structures developed for quantum turbulence and single vortex dynamics research.

Item Type:
Journal Article
Journal or Publication Title:
Applied Physics Letters
Uncontrolled Keywords:
Research Output Funding/yes_internally_funded
Subjects:
?? superfluidityacoustic emissionquartz tuning forkliquid 3hesuperfluid 3he-bmechanical resonatoryes - internally fundedyescondensed matter physicsphysics and astronomy (miscellaneous) ??
ID Code:
192135
Deposited By:
Deposited On:
02 Jun 2023 14:50
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jul 2024 23:45