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

Autor:	S. P. Rubets, E. Ya. Rudavskii, T. N. Antsygina, A. S. Rybalko, V. N. Grigor’ev, A. A. Penzev, E. V. Syrnikov, K. A. Chishko, V. A. Maidanov
Rok vydání:	2005
Předmět:	Phase transition Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Phonon Impurity Metastability General Physics and Astronomy Anomaly (physics) Solid solution
Zdroj:	Low Temperature Physics. 31:1059-1066
ISSN:	1090-6517 1063-777X
Popis:	A precision barometric study has revealed unusual behavior of the pressure of 3He−4He solid solutions with a concentration of around 30% 3He: 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c4a443b5c67678bd342f7a2cafff584e https://doi.org/10.1063/1.2144456 Zobrazit plný text záznamu