Vibrating wire viscometers in high magnetic fields

We report an investigation of the intrinsic properties of vibrating wires made of different materials at low temperatures ( approximately 10 mK < T < 400 mK) and at high magnetic fields (B less than or equal to 11.5 T). The aim of this study was to find a material with sufficiently low intrins...

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Bibliographic Details
Published in:Journal of low temperature physics 1998-03, Vol.110 (5-6), p.1105-1133
Main Authors: VONCKEN, A. P. J, NAISH, J. H, OWERS-BRADLEY, J. R, KÖNIG, R, RIESE, D, POBELL, F
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Damping
Exact sciences and technology
Magnetic field effects
Magnetic field measurement
Niobium alloys
Physics
Platinum alloys
Rheology
Silver
Superfluid helium
Tantalum
Techniques and apparatus
Thermal effects
Tungsten
Viscosity measurements
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Summary:We report an investigation of the intrinsic properties of vibrating wires made of different materials at low temperatures ( approximately 10 mK < T < 400 mK) and at high magnetic fields (B less than or equal to 11.5 T). The aim of this study was to find a material with sufficiently low intrinsic damping even in tho highest fields to allow accurate viscometry in highly diluted spin-polarized super(3)He- super(4)He solutions. A thorough theoretical treatment of the behaviour of vibrating wires (with a high quality factor) in high magnetic fields is presented. Experimental data obtained for NbTi, Ta, W, Ag, manganin and PtW are analyzed within the framework of this theoretical description. Measurements of the field- and temperature dependence of the shift of the resonance frequency and of the internal friction of the vibrating wires clearly indicate that PtW is the most suitable amongst the materials investigated for vibrating wire viscometry in quantum liquids in high magnetic fields.
ISSN:0022-2291
1573-7357
DOI:10.1023/A:1022316317073