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The interfacial thermal resistance between bulk superfluid He-3 and liquid He-3 in aerogel at ultralow temperatures

Fisher, Shaun N. and Guénault, A.M. and Pickett, George R. and Sauer, F. (2003) The interfacial thermal resistance between bulk superfluid He-3 and liquid He-3 in aerogel at ultralow temperatures. Physica B: Condensed Matter, 329-33 (1). pp. 311-312. ISSN 0921-4526

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Abstract

We present the first measurements of the thermal boundary resistance of the interface between the two different liquid phases: bulk superfluid and liquid confined in aerogel. We set up a heat flow along a liquid-filled tube containing a plug of 98% aerogel, and measure the temperature at the two ends. At the lowest temperatures, the resistance is dominated by the boundary resistance at the aerogel surfaces and is unaffected by the superfluid transition of the He-3 in the aerogel. Whereas in conventional Kapitza resistance the boundary conductance is limited by acoustic mismatch, here the conductance is limited by an energy mismatch, since quasiparticles with energies above the bulk B-phase gap may freely cross the interface, while those with lower energies are confined to the aerogel.

Item Type: Article
Journal or Publication Title: Physica B: Condensed Matter
Uncontrolled Keywords: thermal boundary resistance ; aerogel ; superfluid He-3
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Physics
ID Code: 23568
Deposited By: Dr Richard P. Haley
Deposited On: 03 Feb 2009 16:17
Refereed?: Yes
Published?: Published
Last Modified: 30 Jul 2013 11:34
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23568

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