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Superfluidity of 3He in aerogel covered with a thick 4He film

The American Physical Society
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  • Superfluid Helium
  • 3He
  • 4He
  • Aerogel
  • Superfluid Fraction
  • Physics


We have examined the superfluidity of 3He in 98.2% porous silica aerogel with up to 34% 4He at 21.6 bars. The mixture is phase separated for 4He fractions between ∼11% and 34%, and the 4He-rich phase preferentially occupies the regions of highest silica density in the aerogel, thus modifying the distribution of the correlated disorder seen by superfluid 3He. The 3He Tc increases slightly with 4He content while the superfluid fraction decreases rapidly. This behavior is inconsistent with that of 3He in a homogeneously scattering medium and is analogous to that of a granular superconductor.

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