Low-temperature heat capacity of two-component substitutional solutions
Yu. V. SkripnikB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164, KharkovЕ. С. СыркинB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164, KharkovС. Б. ФеодосьевB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164, Kharkov
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The low-frequency dynamics of a lattice containing two-parametric substitutional impurities is studied over a wide concentration range. The restrictions for the method of coherent potential are considered, and analytic expressions for the concentration dependence of low-temperature heat capacity are derived. The results of the analysis are illustrated by numerical calculations of the change in the vibrational spectrum due to two-parametric substitutional impurities.
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