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Transition in the supercritical state of matter: Review of experimental evidence.

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Title: Transition in the supercritical state of matter: Review of experimental evidence.
Authors: Cockrell, C.1 (AUTHOR), Brazhkin, V.V.2 (AUTHOR), Trachenko, K.1 (AUTHOR) k.trachenko@qmul.ac.uk
Source: Physics Reports. Dec2021, Vol. 941, p1-27. 27p.
Subjects: Phases of matter, Phase diagrams, Planetary science, Neutron scattering, Particle motion
Abstract: 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. 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, N 2 , CH 4 , C 2 H 6 , CO 2 and H 2 O 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: recent extensions of analysis of dynamics at the FL, quantum simulations, topological and geometrical approaches, the universality of properties at the FL including transport properties, their fundamental bounds and the implications of the supercritical crossover for astrophysics and planetary science. Finally, we review current theoretical understanding of the supercritical state including its thermodynamic theory and list open problems in the field. [ABSTRACT FROM AUTHOR]
Copyright of Physics Reports is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="AR" term="%22Cockrell%2C+C%2E%22">Cockrell, C.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Brazhkin%2C+V%2EV%2E%22">Brazhkin, V.V.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Trachenko%2C+K%2E%22">Trachenko, K.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> k.trachenko@qmul.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22Physics+Reports%22">Physics Reports</searchLink>. Dec2021, Vol. 941, p1-27. 27p.
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  Data: 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. 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, N 2 , CH 4 , C 2 H 6 , CO 2 and H 2 O 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: recent extensions of analysis of dynamics at the FL, quantum simulations, topological and geometrical approaches, the universality of properties at the FL including transport properties, their fundamental bounds and the implications of the supercritical crossover for astrophysics and planetary science. Finally, we review current theoretical understanding of the supercritical state including its thermodynamic theory and list open problems in the field. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Physics Reports is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.physrep.2021.10.002
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        Text: English
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        PageCount: 27
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        Type: general
      – SubjectFull: Phase diagrams
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      – SubjectFull: Planetary science
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      – SubjectFull: Neutron scattering
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      – SubjectFull: Particle motion
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              Text: Dec2021
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