Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 162, Issue 3-4, Pages 174-181Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-010-0295-z
Keywords
Impurity limited transport; Normal He-3
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Funding
- National Science Foundation at Cornell [DMR-0806629]
- National Science Foundation at Northwestern [DMR-0703656]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0806629, 1103625] Funding Source: National Science Foundation
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We present results of the Q(-1) and period shift, Delta P, for He-3 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 mu m 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 He-3 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, Delta P, 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 He-3 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 He-3.
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