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

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)174-181
Number of pages8
JournalJournal of Low Temperature Physics
Volume162
Issue number3-4
DOIs
StatePublished - Feb 2011

Keywords

  • Impurity limited transport
  • Normal He

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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