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Title: | Instantaneous shear modulus of Yukawa fluids across coupling regimes |
Authors: | Khrapak, S. A. Klumov, B. A. |
Issue Date: | 2020 |
Publisher: | American Institute of Physics Inc. |
Citation: | Khrapak S. A. Instantaneous shear modulus of Yukawa fluids across coupling regimes / S. A. Khrapak, B. A. Klumov. — DOI 10.1063/1.5140858 // Physics of Plasmas. — 2020. — Vol. 27. — Iss. 2. — 024501. |
Abstract: | The high frequency (instantaneous) shear modulus of three-dimensional Yukawa systems is evaluated in a wide parameter range from the very weakly coupled gaseous state to the strongly coupled fluid at the crystallization point (Yukwa melt). This allows us to quantify how shear rigidity develops with increasing coupling and inter-particle correlations. The radial distribution functions (RDFs) needed to calculate the excess shear modulus have been obtained from extensive molecular dynamics (MD) simulations. MD results demonstrate that fluid RDFs appear quasi-universal on the curves parallel to the melting line of a Yukawa solid in accordance with the isomorph theory of Roskilde-simple systems. This quasi-universality allows us to simplify considerably calculations of quantities involving integrals of the RDF (elastic moduli represent just one relevant example). The calculated reduced shear modulus grows linearly with the coupling parameter at weak coupling and approaches a quasi-constant asymptote at strong coupling. The asymptotic value at strong coupling is in reasonably good agreement with the existing theoretical approximation. © 2020 Author(s). |
Keywords: | DISTRIBUTION FUNCTIONS MOLECULAR DYNAMICS SHEAR STRAIN ASYMPTOTIC VALUES COUPLING PARAMETERS HIGH FREQUENCY HF INTER-PARTICLE CORRELATIONS MOLECULAR DYNAMICS SIMULATIONS PARAMETER RANGE RADIAL DISTRIBUTION FUNCTIONS THEORETICAL APPROXIMATIONS ELASTIC MODULI |
URI: | http://elar.urfu.ru/handle/10995/101562 |
Access: | info:eu-repo/semantics/openAccess |
SCOPUS ID: | 85079234222 |
WOS ID: | 000518017700001 |
PURE ID: | 8513a7cd-a145-49a0-ba82-34b6140be002 12249390 |
ISSN: | 1070664X |
DOI: | 10.1063/1.5140858 |
metadata.dc.description.sponsorship: | The work leading to this publication was partly supported by the German Academic Exchange Service (DAAD) with funds from the German Aerospace Center (DLR). We would like to thank Hubertus Thomas for reading the manuscript. |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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