Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101562
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://hdl.handle.net/10995/101562
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85079234222
PURE ID: 12249390
8513a7cd-a145-49a0-ba82-34b6140be002
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, проиндексированные в SCOPUS и WoS CC

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