NMR study of 3He bubbles in phase-separated solid 3He –4He mixtures |
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| Authors: | S C J Kingsley I Kosarev L Roobol V Maidanov J Saunders B Cowan |
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| Affiliation: | (1) Department of Physics, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, United Kingdom;(2) Present address: P. L. Kapitza Institute for Physical Problems, Russian Academy of Sciences, Kosygin St. 2, 117334 Moscow, Russia;(3) Present address: Kernfysisch Versneller Instituut, Zernikelaan 25, NL-9747 AA Groningen;(4) B. I. Verkin Institute for Low Temperature Physics and Engineering, Academy of Sciences of Ukraine, 310164 Kharkov, Ukraine |
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| Abstract: | 3
He droplets embedded in a solid
4
He matrix have been studied by NMR and pressure measurements. One feature of the experiment is that the mixture crystals, of
3
He concentration 1%, are grown under constant pressure conditions to minimise the formation of defects. A number of sample pressures below 34 bar have been studied. Isotopic phase separation and the melting of the bubbles are clearly observed. Measurements of T1
, T2
and magnetisation give detailed information on the structure of the droplets. At an initial sample pressure of 28.3 bar preliminary measurements of the T1
of the liquid bubbles show a temperature dependence of the form (A+ B/T2)–1. This indicates that the expected relaxation in the liquid is augmented by a constant contribution, probably from the surface of the droplets. |
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