Experimental evidence of the Frenkel line in supercritical neon

Prescher, C.; Fomin, Yu. D.; Prakapenka, V. B.; Stefanski, J.; Trachenko, K.; Brazhkin, V. V.

doi:10.1103/PhysRevB.95.134114

Title: Experimental evidence of the Frenkel line in supercritical neon

Journal Article · Wed Apr 26 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.134114· OSTI ID:1353264

Prescher, C. ^[1]; Fomin, Yu. D. ^[2]; Prakapenka, V. B. ^[3]; Stefanski, J. ^[1]; Trachenko, K. ^[4]; Brazhkin, V. V. ^[2]

Univ. zu Köln (Germany)
Russian Academy of Sciences, Moscow (Russia)
Univ. of Chicago, IL (United States)
Queen Mary Univ. of London (United Kingdom)

Recent research suggests that the supercritical state consists of liquidlike and gaslike states where particle dynamics and key system properties are qualitatively different. We report experimental evidence of the structural crossover in supercritical neon at pressure and temperature conditions significantly exceeding the critical point values: 250 P_c and 6.6 T_c. The experimental results show a crossover of the medium-range order structure evidenced by the change of the structure factor with pressure. We also observe the crossover of the short-range order structure indicated by changes in the coordination number. The relative width of the crossover is fairly narrow and is smaller than 10–12% in pressure and temperature. Here, by comparing our experimental results with molecular dynamics simulations, we suggest that the observed crossover can be attributed to the Frenkel line and discuss the relationship between the structural crossover and qualitative changes of dynamical and thermodynamic properties of supercritical matter.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; FG02-94ER14466; EAR 11-57758; EAR1128799

OSTI ID:: 1353264

Alternate ID(s):: OSTI ID: 1353277

Journal Information:: Physical Review B, Vol. 95, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 43 works

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Excitation spectra in fluids: How to analyze them properly Kryuchkov, Nikita P.; Mistryukova, Lukiya A.; Brazhkin, Vadim V. Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-46979-y	journal	July 2019
Percolation in supercritical water: Do the Widom and percolation lines coincide? Strong, Steven E.; Shi, Liang; Skinner, J. L. The Journal of Chemical Physics, Vol. 149, Issue 8 https://doi.org/10.1063/1.5042556	journal	August 2018
Quantumness and state boundaries hidden in supercritical helium-4: A path integral centroid molecular dynamics study Takemoto, Ayumi; Kinugawa, Kenichi The Journal of Chemical Physics, Vol. 149, Issue 20 https://doi.org/10.1063/1.5053988	journal	November 2018
Soft-wall induced structure and dynamics of partially confined supercritical fluids Ghosh, Kanka; Krishnamurthy, C. V. The Journal of Chemical Physics, Vol. 150, Issue 11 https://doi.org/10.1063/1.5092121	journal	March 2019
Extraction of experimental rules of dense fluids using the LIR theory; monatomic fluids Ghandili, Ali; Moeini, Vahid Physics and Chemistry of Liquids https://doi.org/10.1080/00319104.2019.1698040	journal	December 2019
Thermodynamic heterogeneity and crossover in the supercritical state of matter Wang, L.; Yang, C.; Dove, M. T. Journal of Physics: Condensed Matter, Vol. 31, Issue 22 https://doi.org/10.1088/1361-648x/ab0ab1	journal	March 2019
Soft-wall induced structure and dynamics of partially confined supercritical fluids Ghosh, Kanka; Krishnamurthy, C. V. arXiv https://doi.org/10.48550/arxiv.1903.07646	text	January 2019

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Title: Experimental evidence of the Frenkel line in supercritical neon

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