Thermal conductivity of liquid 3He in aerogel:: A gapless superfluid -: art. no. 105303

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.