NMR Study of Solid 3He Droplets In Phase-Separated 3He-4He Mixtures |
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Authors: | S C J Kingsley V Maidanov J Saunders B Cowan |
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Affiliation: | (1) Millikelvin Laboratory, Royal Holloway University of London, Egham Hill, Egham, Surrey, TW20 0EX, UK |
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Abstract: | We report measurements on solid
3
He droplets embedded in a solid
4
He matrix. A feature of our experiments is that the mixture crystals, of 1%
3
He concentration, are grown under constant pressure conditions to minimise the formation of defects. Upon cooling the mixture isotopic phase separation is clearly observed in both pressure and NMR data. At a pressure of 36 bar the
3
He separates as solid droplets. NMR measurements on these droplets indicate values of T
1
and T
2
similar to those in bulk solid
3
He at the same pressure in the temperature-independent régime. Measurements of the bounded diffusion in the droplets indicate a spin diffusion coefficient similar to that in bulk solid
3
He at the same pressure. These measurements also show the size of the droplets to be a few microns. |
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Keywords: | |
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