Journal of Low Temperature Physics

, Volume 162, Issue 3–4, pp 174–181 | Cite as

Mass Coupling and Q−1 of Impurity-Limited Normal 3He in a Torsion Pendulum

  • R. G. Bennett
  • N. Zhelev
  • A. D. Fefferman
  • K. Y. Fang
  • J. Pollanen
  • P. Sharma
  • W. P. Halperin
  • J. M. Parpia
Article

Abstract

We present results of the Q−1 and period shift, ΔP, for 3He confined in a 98% nominal open aerogel on a torsion pendulum. The aerogel is compressed uniaxially by 10% along a direction aligned to the torsion pendulum axis and was grown within a 400 μm tall pancake (after compression) similar to an Andronikashvili geometry. The result is a high Q pendulum able to resolve Q−1 and mass coupling of the impurity-limited 3He over the whole temperature range. After measuring the empty cell background, we filled the cell above the critical point and observe a temperature dependent period shift, ΔP, between 100 mK and 3 mK that is 2.9% of the period shift (after filling) at 100 mK. The Q−1 due to the 3He decreases by an order of magnitude between 100 mK and 3 mK at a pressure of 0.14±0.03 bar. We compare the observable quantities to the corresponding calculated Q−1 and period shift for bulk 3He.

Keywords

Impurity limited transport Normal 3He 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • R. G. Bennett
    • 1
  • N. Zhelev
    • 1
  • A. D. Fefferman
    • 1
  • K. Y. Fang
    • 2
  • J. Pollanen
    • 2
  • P. Sharma
    • 3
  • W. P. Halperin
    • 2
  • J. M. Parpia
    • 1
  1. 1.Department of Physics and LASSPCornell UniversityIthacaUSA
  2. 2.Department of Physics and AstronomyNorthwestern UniversityEvanstonUSA
  3. 3.Dept. of PhysicsRoyal HollowayEghamUK

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