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NMR experiments on pure 3 | He and 3 | He- 4 | He mixtures in silica aerogel

We have carried out a series of NMR experiments on3 He systems filling the pores of silica aerogel with 95% porosity. The systems studied included3 He-4 He mixtures with a wide range of3 He concentrations x3 as well as pure3 He. All experiments were conducted in an 8 T field and for temperatures T ≥... Full description

Main Author: Kalechofsky, N.
Contributors: Candela, D. | Author
Contained in: Journal of Low Temperature Physics Dordrecht : Springer Science + Business Media B.V Vol. 101, No. 3/4 (1995), p. 379-384
Journal Title: Journal of Low Temperature Physics
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Links: Volltext (dx.doi.org)
ISSN: 1573-7357
Additional Keywords: 67.80.Jd
68.45-v
76.60-k
OriginalPaper
DOI: 10.1007/BF00753324
Language: English
Physical Description: Online-Ressource
ID (e.g. DOI, URN): 10.1007/BF00753324
BF00753324
PPN (Catalogue-ID): SPR03091065X
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520 |a We have carried out a series of NMR experiments on3 He systems filling the pores of silica aerogel with 95% porosity. The systems studied included3 He-4 He mixtures with a wide range of3 He concentrations x3 as well as pure3 He. All experiments were conducted in an 8 T field and for temperatures T ≥ 6 mK. This resulted in strong spin polarization at the lowest temperatures (up to approximately 80%) for the localized layer observed for a pure3 He sample. For pure3 He, the magnetic behavior is dominated by the localized spins, which are found to constitute 6% of the sample. The coupled system of localized plus liquid spins displays rapid transverse magnetization relaxation with an anomalous temperature dependence. For intermediate x3 magnetization measurements provide a preliminary indication of the phase diagram of mixtures filling this porous material. The magnetization is hysteretic over some ranges of x3. 
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