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Thermal conductivity of normal liquid He-3 in aerogel.

Reeves, P. A. and Tvalashvili, G. and Fisher, Shaun N. and Guénault, A.M. and Pickett, George R. (2002) Thermal conductivity of normal liquid He-3 in aerogel. Journal of Low Temperature Physics, 129 (3-4). pp. 185-193. ISSN 0022-2291

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Abstract

We report thermal conductivity measurements for normal phase liquid He-3 inside 98 and 95% aerogels at dilution refrigerator temperatures (5 to 50 mK). In our measurements we use cylindrical samples of aerogel which have been fabricated inside quartz tubes. Each tube is enclosed at one end by a small chamber to which a known heat input is applied at a measured temperature. The other end is in an open volume of helium which is heat sunk to the refrigerator. Vibrating wire thermometry is used to measure the helium temperatures. The thermal conductivity measurements show clearly the effects of quasiparticle-"impurity" scattering, from which values of the mean free path are derived. These are 92 nm for the 98% aerogel and 56 nm for the 95% sample.

Item Type: Article
Journal or Publication Title: Journal of Low Temperature Physics
Uncontrolled Keywords: helium-3 ; aerogel ; thermal conductivity
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23569
Deposited By: Dr Richard P. Haley
Deposited On: 03 Feb 2009 16:21
Refereed?: Yes
Published?: Published
Last Modified: 17 Jul 2013 10:23
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23569

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