Damping of a vibrating wire in spin polarized liquid super(3)He- super(4)He mixtures

In this paper we report measurements of the damping of a vibrating wire in spin polarized liquid helium mixtures. The dilute helium solutions have been cooled by nuclear demagnetization in high magnetic fields such that the spin polarization for a 0.04% mixture is as high 75%. A PtW alloy vibrating...

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Bibliographic Details
Published in:Journal of low temperature physics 1998-01, Vol.110 (1-2), p.321-326
Main Authors: Owers-Bradley, J R, Bowley, R M, Naish, J H, Richardson, P J, Voncken, A P J, Koenig, R K
Format: Article
Language:English
Subjects:
Binary mixtures
Damping
Demagnetization
Magnetic field effects
Platinum alloys
Polarization
Solutions
Vibrations (mechanical)
Viscosity of liquids
Wire
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Summary:In this paper we report measurements of the damping of a vibrating wire in spin polarized liquid helium mixtures. The dilute helium solutions have been cooled by nuclear demagnetization in high magnetic fields such that the spin polarization for a 0.04% mixture is as high 75%. A PtW alloy vibrating wire has been used to probe the viscosity of the liquid. The increase in viscosity on changing the magnetic field from 3 tesla to 11.5 tesla is a factor 3.5 at the lowest temperatures. The results are compared to theory allowing for both s-wave and p-wave scattering.
ISSN:0022-2291