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4He nanoclusters around vacancies in solid solutions of 4He in 3He
- Source :
- Low Temperature Physics. 29:362-368
- Publication Year :
- 2003
- Publisher :
- AIP Publishing, 2003.
-
Abstract
- Precise measurements of the pressure in solid solutions of 4He in 3He are performed with temperature cycling in the phase-separation range. It is found that as a result of such cycling the difference ΔP of the pressures between the minimum (≈100 mK) and maximum (≈200 mK) temperatures decreases by a factor of approximately 3 and then remains unchanged for a long time. The initial values of ΔP and the pressure P0 in a uniform solid solution 4He–3He are restored only after the sample is heated to a temperature substantially above the phase-separation point. The data obtained are explained on the basis of the hypothesis that under these conditions clusters of pure 4He form around quasiequilibrium vacancies. A thermodynamic calculation of such clusters is performed. The computational results made it possible to give a quantitative explanation of the distinctive features observed. Comparing the calculations with experiment made it possible to determine the cluster concentration, 8×10−5, and the cluster radius, ...
Details
- ISSN :
- 10906517 and 1063777X
- Volume :
- 29
- Database :
- OpenAIRE
- Journal :
- Low Temperature Physics
- Accession number :
- edsair.doi...........b0159fc675036cba9f941c5d6dfa0a1f