Loffe-Regel' crossover and boson peaks in disordered solid solutions and similar anomalies in heterogeneous crystalline structures

I. A. Gospodarev, V. I. Grishaev, A. V. Kotlyar, K. V. Kravchenko, E. V. Manzheliǐ, E. S. Syrkin, S. B. Feodos'Ev

Research output: Contribution to journalArticle

Abstract

Low-frequency features of the phonon spectra of disordered solid solutions and heterogeneous crystalline structures are analyzed at the microscopic level. It is shown that boson-peak type excitations can arise in disordered solid solutions whose sites have only translational degrees of freedom. Thus it is established that such excitations appear mainly because of the additional positional dispersion of sound waves which is due to the disordering. The influence of boson-peak excitations on the low-temperature specific heat is investigated. It is found that in a number of cases the specific heat is more sensitive to excitations of this kind than the low-frequency density of states is. It is shown that anomalies similar to Ioffe-Regel' crossover and boson peaks can also arise in disordered heterogeneous crystalline structures with a complicated lattice.

Original languageEnglish
Pages (from-to)655-664
Number of pages10
JournalLow Temperature Physics
Volume34
Issue number8
DOIs
Publication statusPublished - 9 Oct 2008

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crossovers
solid solutions
bosons
anomalies
excitation
specific heat
low frequencies
sound waves
degrees of freedom

Bibliographical note

Copyright © 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Low Temperature Physics 34, 655 (2008) and may be found at https://doi.org/10.1063/1.2967512

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Gospodarev, I. A., Grishaev, V. I., Kotlyar, A. V., Kravchenko, K. V., Manzheliǐ, E. V., Syrkin, E. S., & Feodos'Ev, S. B. (2008). Loffe-Regel' crossover and boson peaks in disordered solid solutions and similar anomalies in heterogeneous crystalline structures. Low Temperature Physics, 34(8), 655-664. https://doi.org/10.1063/1.2967512
Gospodarev, I. A. ; Grishaev, V. I. ; Kotlyar, A. V. ; Kravchenko, K. V. ; Manzheliǐ, E. V. ; Syrkin, E. S. ; Feodos'Ev, S. B. / Loffe-Regel' crossover and boson peaks in disordered solid solutions and similar anomalies in heterogeneous crystalline structures. In: Low Temperature Physics. 2008 ; Vol. 34, No. 8. pp. 655-664.
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Loffe-Regel' crossover and boson peaks in disordered solid solutions and similar anomalies in heterogeneous crystalline structures. / Gospodarev, I. A.; Grishaev, V. I.; Kotlyar, A. V.; Kravchenko, K. V.; Manzheliǐ, E. V.; Syrkin, E. S.; Feodos'Ev, S. B.

In: Low Temperature Physics, Vol. 34, No. 8, 09.10.2008, p. 655-664.

Research output: Contribution to journalArticle

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AU - Syrkin, E. S.

AU - Feodos'Ev, S. B.

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