КФУ. Карточка публикации. The nature of collective excitations and their crossover at extreme supercritical conditions

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THE NATURE OF COLLECTIVE EXCITATIONS AND THEIR CROSSOVER AT EXTREME SUPERCRITICAL CONDITIONS

Форма представления

Статьи в зарубежных журналах и сборниках

Год публикации

2019

Язык

английский

Авторы, сотрудники КФУ

Мокшин Анатолий Васильевич, автор

Библиографическое описание на языке оригинала

Wang L. The nature of collective excitations and their crossover at extreme supercritical conditions / L. Wang, C. Yang, M. T. Dove, A. V. Mokshin, V. V. Brazhkin & K. Trachenko // Scientific Reports. - 2019. - vol. 9. - Article number: 755 [DOI:10.1038/s41598-018-36178-6]

Аннотация

Physical properties of an interacting system are governed by collective excitations, but their nature at extreme supercritical conditions is unknown. Here, we present direct evidence for propagating solid-like longitudinal phonon-like excitations with wavelengths extending to interatomic separations deep in the supercritical state at temperatures up to 3,300 times the critical temperature. We observe that the crossover of dispersion curves develops at k points reducing with temperature. We interpret this effect as the crossover from the collective phonon to the collisional mean-free path regime of particle dynamics and find that the crossover points are close to both the inverse of the shortest available wavelength in the system and to the particle mean free path inferred from experiments and theory. Notably, both the shortest wavelength and mean free path scale with temperature with the same power law, lending further support to our findings.

Ключевые слова

supercritical fluids, collective dynamics, liquids

Название журнала

SCIENTIFIC REPORTS

URL

https://www.nature.com/articles/s41598-018-36178-6

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https://repository.kpfu.ru/?p_id=195090

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Полная запись метаданных

Поле DC	Значение	Язык
dc.contributor.author	Мокшин Анатолий Васильевич	ru_RU
dc.date.accessioned	2019-01-01T00:00:00Z	ru_RU
dc.date.available	2019-01-01T00:00:00Z	ru_RU
dc.date.issued	2019	ru_RU
dc.identifier.citation	Wang L. The nature of collective excitations and their crossover at extreme supercritical conditions / L. Wang, C. Yang, M. T. Dove, A. V. Mokshin, V. V. Brazhkin & K. Trachenko // Scientific Reports. - 2019. - vol. 9. - Article number: 755 [DOI:10.1038/s41598-018-36178-6]	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/?p_id=195090	ru_RU
dc.description.abstract	SCIENTIFIC REPORTS	ru_RU
dc.description.abstract	Physical properties of an interacting system are governed by collective excitations, but their nature at extreme supercritical conditions is unknown. Here, we present direct evidence for propagating solid-like longitudinal phonon-like excitations with wavelengths extending to interatomic separations deep in the supercritical state at temperatures up to 3,300 times the critical temperature. We observe that the crossover of dispersion curves develops at k points reducing with temperature. We interpret this effect as the crossover from the collective phonon to the collisional mean-free path regime of particle dynamics and find that the crossover points are close to both the inverse of the shortest available wavelength in the system and to the particle mean free path inferred from experiments and theory. Notably, both the shortest wavelength and mean free path scale with temperature with the same power law, lending further support to our findings.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	supercritical fluids	ru_RU
dc.subject	collective dynamics	ru_RU
dc.subject	liquids	ru_RU
dc.title	The nature of collective excitations and their crossover at extreme supercritical conditions	ru_RU
dc.type	Статьи в зарубежных журналах и сборниках	ru_RU