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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2012, Volume 95, Issue 3, Pages 179–184
(Mi jetpl2438)
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This article is cited in 30 scientific papers (total in 30 papers)
CONDENSED MATTER
Universal crossover of liquid dynamics in supercritical region
V. V. Brazhkina, Yu. D. Fomina, A. G. Lyapina, V. N. Ryzhova, K. Trachenkob a Institute for High Pressure Physics, Russian Academy of Sciences
b School of Physics, Queen Mary, University of London
Abstract:
We demonstrate that all liquids in supercritical region may exist in two qualitatively different states: solid-like and gas-like. Solid-like to gas-like crossover corresponds to the condition $\tau\approx\tau_0$, where $\tau$ is liquid relaxation time and $\tau_0$ is the minimal period of transverse waves. This condition corresponds to the loss of shear stiffness of a liquid at all frequencies and defines a new narrow crossover zone on the phase diagram. We show that the intersection of this zone corresponds to the disappearance of high-frequency sound, qualitative changes of diffusion and viscous flow, increase of particle thermal speed to half of the speed of sound and reduction of the constant volume specific heat to $2k_{\rm B}$ per particle. The new crossover is universal: it separates two liquid states at arbitrarily high pressure and temperature, and even exists in systems where liquid – gas transition and the critical point are absent overall.
Received: 11.01.2012
Citation:
V. V. Brazhkin, Yu. D. Fomin, A. G. Lyapin, V. N. Ryzhov, K. Trachenko, “Universal crossover of liquid dynamics in supercritical region”, Pis'ma v Zh. Èksper. Teoret. Fiz., 95:3 (2012), 179–184; JETP Letters, 95:3 (2012), 164–169
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https://www.mathnet.ru/eng/jetpl2438 https://www.mathnet.ru/eng/jetpl/v95/i3/p179
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Abstract page: | 358 | Full-text PDF : | 103 | References: | 51 | First page: | 8 |
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