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Thermal conductivity of liquid He-3 in aerogel: A gapless superfluid.

Research output: Contribution to journalJournal article

Published

<mark>Journal publication date</mark>09/2003
<mark>Journal</mark>Physical Review Letters
Issue10
Volume91
Number of pages0
Pages105303
<mark>Original language</mark>English

Abstract

We have measured the thermal conductivity of liquid He-3 in 98% aerogel at ultralow temperatures. Aerogel introduces disorder on a scale comparable to the superfluid coherence length. At low pressures the liquid in the aerogel shows normal-state behavior with conductivity linear in temperature. At pressures above similar to6 bars the onset of superfluidity suppresses the conductivity and the thermal conductivity again tends towards linear behavior in the very low temperature limit, providing strong evidence that here the liquid He-3 in the aerogel is behaving as a gapless superfluid.