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ЖУРНАЛЫ // Письма в Журнал экспериментальной и теоретической физики // Архив

Письма в ЖЭТФ, 2002, том 76, выпуск 9, страницы 650–654 (Mi jetpl2969)

Эта публикация цитируется в 15 статьях

КОНДЕНСИРОВАННЫЕ СРЕДЫ

On the theory of Boson peak in glasses

V. L. Gurevicha, D. A. Parshinb, H. R. Schoberc

a Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg
b Saint-Petersburg State Technical University
c Institut für Festkörperforschung, Forschungszentrum, Jülich

Аннотация: A universal mechanism of the Boson peak formation in glasses is proposed. The mechanism is based on the concept of interacting quasi-local oscillators. Even in the case of weak interaction the low-frequency spectrum becomes unstable. Due to anharmonicity the system undergoes a transition into a new stable configuration. As a result, below some characteristic frequency $\omega_c$, proportional to the typical strength of interaction, the renormalized density of states becomes a universal function of $\omega$ with a Boson peak feature, i.e. the reduced density of states $g(\omega)/\omega^2$ has a maximum at a frequency $\omega_b\ll\omega_c$. We derive an analytical form of this function.

PACS: 61.43.Fs, 63.50.+x, 78.30.Ly

Поступила в редакцию: 23.09.2002

Язык публикации: английский


 Англоязычная версия: Journal of Experimental and Theoretical Physics Letters, 2002, 76:9, 553–557

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