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Possible Existence of Dense Superfluid 3He-4He Mixture in Aerogel

Possible Existence of Dense Superfluid 3He-4He Mixture in Aerogel 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Possible Existence of Dense Superfluid 3He-4He Mixture in Aerogel

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References (1)

Publisher
Springer Journals
Copyright
Copyright © 2012 by Springer Science+Business Media New York
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/s10909-012-0836-8
Publisher site
See Article on Publisher Site

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.

Journal

Journal of Low Temperature PhysicsSpringer Journals

Published: Nov 28, 2012

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