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While studying superfluid 3He of 2.4 MPa in 97.5 %-porosity aerogel with NMR/MRI techniques, we find that the T C is reduced when more than adequate amount of 4He, which covers the surface of silica strands, is introduced. For a sample, whose T C is reduced to as low as 0.9 mK, we find that the spin diffusion coefficient in the normal phase is increased by a factor of 1.56 both in high temperature region, where 3He-3He scattering dominates, and in low temperature region, where 3He-aerogel scattering dominates. This enhancement is attributed to a modification of Landau parameter $F_{0}^{a}$ from −0.757 to −0.62, which is a change towards less ferromagnetic direction. The modification of microscopic quantity could be explained if small amount of 4He has homogeneously mixed into liquid 3He in the aerogel.
Journal of Low Temperature Physics – Springer Journals
Published: Nov 28, 2012
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