KFU. Card publication. The nature of collective excitations and their crossover at extreme supercritical conditions

KAZAN
FEDERAL UNIVERSITY

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

Form of presentation

Articles in international journals and collections

Year of publication

2019

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Authors, employees of KFU

Mokshin Anatoliy Vasilevich, author

Bibliographic description in the original language

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]

Annotation

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.

Keywords

supercritical fluids, collective dynamics, liquids

The name of the journal

SCIENTIFIC REPORTS

URL

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

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=195090&p_lang=2

Resource files

File name	Size (MB)	Format
F_file.pdf	1,35	pdf	show / download

Full metadata record

Field DC	Value	Language
dc.contributor.author	Mokshin Anatoliy Vasilevich	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/eng/?p_id=195090&p_lang=2	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	Articles in international journals and collections	ru_RU