Theoretical and experimental investigation of the effect of substitutional impurities on the vibrational characteristics of anisotropic crystals at low temperatures
V. P. PopovGor’kii State University, Khar’kov, and Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovE. S. SyrkinGor’kii State University, Khar’kov, and Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovС. Б. ФеодосьевGor’kii State University, Khar’kov, and Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
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Using Peresada’s computational method with a concrete lattice model, we study the lifting of the degeneracy of a quasilocal vibration due to the presence of a heavy isotropic impurity in an anisotropic crystal. Experimentally, this is observed in measurements of the linear expansion of a beryllium–copper alloy.
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