Heat capacity of separating ³He–⁴He solid mixtures: Long-range correlation effects

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• 作者：T. N. Antsygina ; K. A. Chishko ; V. A. Slusarev
• 刊名：Physica B
• 出版年：2000
• 出版时间：July 2000
• 年：2000
• 卷：284-288
• 期：Part 1
• 页码：373-374
• 全文大小：72 K

文摘

An extension of the quasi-chemical approximation for the lattice gas model is proposed to describe the impurity heat capacity of solid ³He–⁴He mixtures both below and above the phase separation temperature T_s. It is shown that in the fluctuation region at T>T_s the temperature dependence of the heat capacity is completely determined by long-range correlation effects in the impurity subsystem. The proposed theory enables us to explain the experimental data by Edwards, McWilliams and Daunt for all concentrations of ⁴He.