Experimental evidence of the Frenkel line in supercritical neon

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 sign...

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Bibliographic Details
Published in:Physical review. B 2017-04, Vol.95 (13), p.134114, Article 134114
Main Authors: Prescher, C., Fomin, Yu. D., Prakapenka, V. B., Stefanski, J., Trachenko, K., Brazhkin, V. V.
Format: Article
Language:English
Subjects:
classical fluids
condensed matter & materials physics
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Coordination numbers
critical phenomena
Critical point
Crossovers
liquids
Molecular dynamics
Neon
phase transitions
Short range order
specific phase transitions
statistical physics
Structure factor
Thermodynamic properties
X-ray pair-distribution function analysis
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Summary: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: 250Pc and 6.6Tc. 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. 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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.95.134114