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Effect of discrete breathers on macroscopic properties of the Fermi-Pasta-Ulam chainстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 27 октября 2021 г.
- Авторы: Korznikova E.A., Morkina A.Y., Singh M., Krivtsov A.M., Kuzkin V.A., Gani V.A., Bebikhov Y.V., Dmitriev S.V.
- Журнал: European Physical Journal B
- Том: 93
- Номер: 7
- Год издания: 2020
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Номер статьи: 123
- DOI: 10.1140/epjb/e2020-10173-7
- Аннотация: The effect of discrete breathers (DBs) on macroscopic properties of the Fermi-Pasta-Ulam chain with symmetric and asymmetric potentials is investigated. The total to kinetic energy ratio (related to specific heat), stress (related to thermal expansion), and Young’s modulus are monitored during the development of modulational instability of the zone boundary mode. The instability results in the formation of chaotic DBs followed by the transition to thermal equilibrium when DBs disappear due to energy radiation in the form of small-amplitude phonons. It is found that DBs reduce the specific heat for all the considered chain parameters. They increase the thermal expansion when the potential is asymmetric and, as expected, thermal expansion is not observed in the case of symmetric potential. The Young’s modulus in the presence of DBs is smaller than in thermal equilibrium for the symmetric potential and for the potential with a small asymmetry, but it is larger than in thermal equilibrium for the potential with greater asymmetry. Our results can be useful for setting experiments on the identification of DBs in crystals by measuring their macroscopic properties.
- Добавил в систему: Гани Вахид Абдулович
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | Korznikova_EPJ_B_2020.pdf | 1,6 МБ | 30 января 2025 [Vakhid.Gani] |