Structure of Multicomponent Coulomb Crystals

Abstract

Coulomb plasmas crystallize in a number of physical systems, such as dusty plasmas, neutron star crusts, and white dwarf cores. The crystal structure of the one component and binary plasma has received significant attention in the literature, though the less studied multicomponent plasma may be most relevant for many physical systems which contain a large range of particle charges. We report on molecular dynamics simulations of multicomponent plasmas near the melting temperature with mixtures taken to be realistic X-ray burst ash compositions. We quantify the structure of the crystal with the bond order parameters and radial distribution function. Consistent with past work, low charge particles form interstitial defects and we argue that they are in a quasi-liquid state within the lattice. The lattice shows screening effects which preserves long range order despite the large variance in particle charges which may impact transport properties relevant to astrophysics.

arXiv comment10 pages, 8 figures, accepted to PRE

References in corpus (18)

• Accurate determination of crystal structures based on averaged local bond order parameters
• Mapping crustal heating with the cooling lightcurves of quasi-persistent transients
• Melting of icosahedral gold nanoclusters from molecular dynamics simulations
• Core crystallization and pile-up in the cooling sequence of evolving white dwarfs
• Astromaterial Science and Nuclear Pasta
• Gravitational Settling of 22Ne in Liquid White Dwarf Interiors
• Phase separation in the crust of accreting neutron stars
• Electron-ion scattering in dense multi-component plasmas: application to the outer crust of an accreting neutron star
• A strong shallow heat source in the accreting neutron star MAXI J0556-332
• Transport properties of degenerate electrons in neutron star envelopes and white dwarf cores
• Equation of state of classical Coulomb plasma mixtures
• Thermal conductivity and phase separation of the crust of accreting neutron stars
• Diffusion in Coulomb Crystals
• Effective Potential Theory for Diffusion in Binary Ionic Mixtures
• Thermal conductivity and impurity scattering in the accreting neutron star crust
• Polycrystalline Crusts in Accreting Neutron Stars
• A Survey of Chemical Separation in Accreting Neutron Stars
• Neutron Star Crust and Molecular Dynamics Simulation

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• Precise Diffusion Coefficients for White Dwarf Astrophysics
• Black Dwarf Supernova in the Far Future
• Phase diagrams of binary ionic mixtures and white dwarf cooling
• Crystallization in single and multicomponent Neutron Star crusts
• Electrostatic energy of solid binary ionic mixtures