On the temperature dependence of the density of states of liquids at low energies

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dc.contributor.authorJin, Sen_AU
dc.contributor.authorFan, Xen_AU
dc.contributor.authorStamper, Cen_AU
dc.contributor.authorMole, RAen_AU
dc.contributor.authorYu, Yen_AU
dc.contributor.authorYu, DHen_AU
dc.contributor.authorBaggioli, Ben_AU
dc.contributor.authorHong, Len_AU
dc.date.accessioned2024-09-19T02:58:07Zen_AU
dc.date.available2024-09-19T02:58:07Zen_AU
dc.date.issued2024-08-13en_AU
dc.date.statistics2024-08-23en_AU
dc.description.abstractWe report neutron-scattering measurements of the density of states (DOS) of water and liquid Fomblin in a wide range of temperatures. In the liquid phase, we confirm the presence of a universal low-energy linear scaling of the experimental DOS as a function of the frequency, g(w) = a(T)w , which persists at all temperatures. The low-frequency scaling of the DOS exhibits a sharp jump at the melting point of water, below which the standard Debye’s law, g(w) ∝ w2 , is recovered. On the contrary, in Fomblin, we observe a continuous transition between the two exponents reflecting its glassy dynamics, which is confirmed by structure measurements. More importantly, in both systems, we find that the slope a(T) grows with temperature following an exponential Arrhenius-like form, a(T) ∝ exp(−<E>/T) . We confirm this experimental trend using molecular dynamics simulations and show that the prediction of instantaneous normal mode (INM) theory for a(T) is in qualitative agreement with the experimental data. © The Authors - Open Access This article is licensed under a Creative Commons Attribution 4.0 International License.en_AU
dc.description.sponsorshipWe would like to thank H. Xu, J. Douglas, Y. Feng and especially T. Keyes for fruitful discussions and related collaborations on the topic of liquids. We are grateful to Tom Keyes for comments and suggestions on a preliminary version of this manuscript. M.B. acknowledges the support of the Shanghai Municipal Science and Technology Major Project (Grant No.2019SHZDZX01) and the sponsorship from the Yangyang Development Fund. D. Y., C. S. and R. M. acknowledge the beam time awarded from ANSTO for the access to Pelican instrument (P13964).en_AU
dc.identifier.articlenumber18805en_AU
dc.identifier.citationJin, S., Fan, X., Stamper, C., Mole, R. A., Yu, Y., Hong, L., Yu, D., & Baggioli, M. (2024). On the temperature dependence of the density of states of liquids at low energies. Scientific Reports, 14, 1-14, 18805. doi:10.1038/s41598-024-69504-2en_AU
dc.identifier.issn2045-2322en_AU
dc.identifier.journaltitleScientific Reportsen_AU
dc.identifier.pagination1-14en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15681en_AU
dc.identifier.volume14en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.relation.urihttps://doi.org/10.1038/s41598-024-69504-2en_AU
dc.subjectTemperature rangeen_AU
dc.subjectDensityen_AU
dc.subjectLiquidsen_AU
dc.subjectNeutronsen_AU
dc.subjectScatteringen_AU
dc.subjectDebye-Scherrer methoden_AU
dc.subjectWateren_AU
dc.subjectSimulationen_AU
dc.subjectDataen_AU
dc.subjectSuperconductivityen_AU
dc.titleOn the temperature dependence of the density of states of liquids at low energiesen_AU
dc.typeJournal Articleen_AU
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