Possible Existence of Dense Superfluid 3He-4He Mixture in Aerogel |
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Authors: | R. Ito Y. Tanaka J. Hitomi R. Toda M. Kanemoto Y. Sasaki |
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Affiliation: | 1. Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502, Japan 2. Research Center for Low Temperature and Materials Sciences, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto, 606-8501, Japan
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Abstract: | 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. |
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