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Thermal conductivity of normal liquid He-3 in aerogel.

Research output: Contribution to journalJournal article

Published

Journal publication date11/2002
JournalJournal of Low Temperature Physics
Journal number3-4
Volume129
Number of pages9
Pages185-193
Original languageEnglish

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.