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

Research output: Contribution to journalJournal article

Published

Journal publication date09/2003
JournalPhysical Review Letters
Journal number10
Volume91
Number of pages0
Pages105303
Original languageEnglish

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.