This article is cited in 7 papers

CONDENSED MATTER

Observation of Andreev-Pushkarov vacancy clusters in phase-separated solid solutions of $^4$He in $^3$He

A. N. Gan'shin, V. N. Grigor'ev, V. A. Maidanov, A. A. Penzev, E. Ya. Rudavskii, A. S. Rybalko, E. V. Syrnikov

B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Khar'kov

Abstract: New features are observed for the pressure in a phase-separated dilute solid solution of $^4$He in $^3$He subjected to multiple temperature cycling within the phase-separation region. The results are explained within the framework of the hypothesis of A. F. Andreev and D. I. Pushkarov that the vacancies in a crystal without ideal periodicity are surrounded by clusters with a periodic structure. The equation for determining the radius of a cluster of pure $^4$He in a solution of $^4$He in $^3$He is refined. This hypothesis is shown to provide quantitative agreement between the calculated and experimental data under the assumption that the homogenization of the phase-separated solution is accompanied by the formation of metastable vacancies with a concentration of $\sim(4-5)\times 10^{-5}$.

PACS: 67.60.-g

Received: 09.02.2001

 English version: Journal of Experimental and Theoretical Physics Letters, 2001, 73:6, 289–293

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