Experimental and modeling evidence for structural crossover in supercritical 
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Cockrell, Cillian; Dicks, Oliver A.; Trachenko, Kostya; Soper, A. K.; Бражкин, В. В.; Marinakis, Sarantos

doi:10.1103/physreve.101.052109

Cited by 16 publications

(10 citation statements)

References 45 publications

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“…Guided by theoretical prediction, subsequent experiments have confirmed the transition at the Frenkel line in supercritical Ne [52], CH 4 [53], N 2 [54], C 2 H 6 [55] and CO 2 [56] using X-ray, neutron and Raman scattering techniques.…”

Section: Dynamical Crossover At the Frenkel Linementioning

confidence: 88%

Similarity between the kinematic viscosity of quark-gluon plasma and liquids at the viscosity minimum

2021

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Recently, it has been found that the kinematic viscosity of liquids at the minimum, \nu_mνm, can be expressed in terms of fundamental physical constants, giving \nu_mνm on the order of 10^{-7}~{m^2/s}10−7m2/s. Here, we show that the kinematic viscosity of quark-gluon plasma (QGP) has a similar value and support this finding by experimental data and theoretical estimations. The similarity is striking, given that the dynamic viscosity and the density of QGP are about 16 orders of magnitude larger than in liquids and that the two systems have disparate interactions and fundamental theories. We discuss the implications of this result for understanding the QGP including the similarity of flow and particle dynamics at the viscosity minimum, the associated dynamical crossover and universality of shear diffusivity.

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Section: Dynamical Crossover At the Frenkel Linementioning

confidence: 88%

Similarity between the kinematic viscosity of quark-gluon plasma and liquids at the viscosity minimum

2021

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“…This allowed authors in Ref. [71] to perform statistical analysis, which decisively confirmed a crossover in the functional dependence of r/r 0 on (V /V 0 ) 1/3 . In this sense the NS data corroborate the structural crossover in real space, rather than unequivocally demonstrating it alone.…”

Section: Carbon Dioxidementioning

confidence: 77%

“…The proportionality constant will depend on the system's structure and on the existence of more condensed phases at higher densities (see Ref. [71] for a detailed discussion). If, on the other hand, the system's structure changes due to coordination rearrangements or a change in orientation order, for example, r fnn will experience changes from more sources than just the change in density, and will therefore not be proportional to V 1/3 .…”

Section: Carbon Dioxidementioning

confidence: 99%

Transition in the supercritical state of matter: experimental evidence

Cockrell,

Brazhkin,

Trachenko

2021

Preprint

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A large and mostly unexplored part of the phase diagram lies above the critical point. The supercritical matter was traditionally believed to be physically homogeneous with no discernible differences between liquidlike and gaslike states. More recently, several proposals have been put forward challenging this view, and here we review the history of this research. Close to the critical point, persisting critical anomalies enable the separation of the supercritical state into two different states. About a decade ago, it was proposed that the Frenkel line (FL), corresponding to the dynamical transition of particle motion and related thermodynamic and structural transitions, gives a unique and path-independent way to separate the supercritical states into two qualitatively different states and extends to arbitrarily high pressure and temperature on the phase diagram. Here, we review several lines of enquiry that followed. We focus on the experimental evidence of transitions in deeply supercritical Ne, N2, CH4, C2H6, CO2 and H2O at the FL detected by a number of techniques including X-ray, neutron and Raman scattering experiments. We subsequently summarise other developments in the field, including recent extensions of analysis of dynamics at the FL, quantum simulations, topological and geometrical approaches as well as universality of properties at the FL. Finally, we review current theoretical understanding of the supercritical state and list open problems in the field. Contents

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“…This disappearance of transverse modes and the condition c V = 2 correspond to the Frenkel line, which separates two dynamical regimes of particle motion: combined oscillatory and diffusive motion in the low-temperature "rigid" liquid (rigid in a sense of its ability to support solid-like transverse modes); and purely diffusive motion in the high-temperature non-rigid gaslike fluid [12]. Experimentally, the transitions at the Frenkel line have been observed in supercritical Ne [21], CH 4 [22], N 2 [23], C 2 H 6 [24] and CO 2 [25] using X-ray, neutron and Raman scattering techniques.…”

Section: Resultsmentioning

confidence: 99%

Universal interrelation between dynamics and thermodynamics of fluids: dynamically-driven "c"-transition

Cockrell,

Brazhkin,

Trachenko

2021

Preprint

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Our first very wide survey of the supercritical phase diagram and its key properties reveals a universal interrelation between dynamics and thermodynamics and a transition between liquidlike and gaslike states. This is seen in the master plot showing a collapse of the data representing the dependence of specific heat on key dynamical parameters in the system for many different paths on the phase diagram. As a result, the observed transition is path-independent and occurs at many hundred times the critical pressure and temperature. We call it a "c"-transition due to the "c"shaped curve parametrising the dependence of the specific heat on key dynamical parameters. The "c"-transition provides a new structure to the phase diagram. On the basis of path independence and the existence of a special inversion point on the phase diagram, we conjecture the existence of a new phase transition in deeply supercritical state.

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Experimental and modeling evidence for structural crossover in supercritical CO2

Cited by 16 publications

References 45 publications

Similarity between the kinematic viscosity of quark-gluon plasma and liquids at the viscosity minimum

Similarity between the kinematic viscosity of quark-gluon plasma and liquids at the viscosity minimum

Transition in the supercritical state of matter: experimental evidence

Universal interrelation between dynamics and thermodynamics of fluids: dynamically-driven "c"-transition

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