Triple point of Yukawa systems

Physics

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Impurities In Plasmas, General Studies Of Phase Transitions, Colloids, Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus

Scientific paper

The molecular dynamics simulations of Yukawa (i.e., screened-Coulomb) systems that were applied to the regime of weak screening in an earlier study [S. Hamaguchi, R. T. Farouki, and D. H. E. Dubin, J. Chem. Phys. 105, 7641 (1996)] are extended to the strong screening regime. Transition temperatures at the fluid-solid phase boundary and the solid-solid phase boundary are obtained as functions of the screening parameter κ=a/λD (i.e., the ratio of the Wigner-Seitz radius a to the Debye length λD). The resulting phase diagram also covers the triple point-the intersection of the fluid-solid and solid-solid phase boundaries-at κ=4.28 and Γ=5.6×103, where Γ is the ratio of the Coulomb potential energy to the kinetic energy per particle (i.e., Γ=Q2/4πɛ0akT, where Q is the charge of each Yukawa particle and T is the system temperature). Yukawa systems serve as models for plasmas and colloidal suspensions of charged particulates.

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