Detection of fluctuation effects near the phase separation temperature of concentrated 3 He − 4 He solid solutions

A precision barometric study has revealed unusual behavior of the pressure of 3 He − 4 He solid solutions with a concentration of around 30% 3 He : in the pre-separation region the pressure increases with decreasing temperature long before the start of the phase transition. It is established that su...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2005-12, Vol.31 (12), p.1059-1066
Main Authors: Antsygina, T. N., Grigor’ev, V. N., Maidanov, V. A., Penzev, A. A., Rubets, S. P., Rudavskii, E. Ya, Rybalko, A. S., Syrnikov, E. V., Chishko, K. A.
Format: Article
Language:English
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Summary:A precision barometric study has revealed unusual behavior of the pressure of 3 He − 4 He solid solutions with a concentration of around 30% 3 He : in the pre-separation region the pressure increases with decreasing temperature long before the start of the phase transition. It is established that such an anomaly is due to correlation effects in the impurity subsystem which give rise to large-scale fluctuations of the impurity concentration, and the fluctuation contribution to the pressure is much greater than the phonon contribution. Quantitative agreement between the experimental data and the proposed theory is obtained, and it is shown that the observed temperature dependence of the pressure in the pre-separation and metastable regions can be explained only when the long-range character of the interaction between impurities is taken into account.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.2144456