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P: Fachverband Plasmaphysik

P 23: Complex Plasmas and Dusty Plasmas II

P 23.2: Vortrag

Donnerstag, 29. Februar 2024, 17:00–17:15, ELP 6: HS 3

The asynchronous melting process of binary mixtures — •Yang Liu and Dietmar Block — IEAP, Christian-Albrechts-Universität, D-24098 Kiel, Germany

Melting processes in binary mixtures are compared to their single-component counterparts a sophisticated task. Already the collective crystalline behavior within the mixture is poorly understood [1]. The glass-like formation of irregular and stable structures in the mixing region of binary mixtures does not allow to employ methods based on empirical rules derived from topological structures to describe lattice melting issues. This contribution utilizes the local relative interparticle fluctuation (IDF) method to investigate the melting process of finite binary monolayers and its dependence on component concentrations and size differences [2]. Our results indicate that, unlike monodisperse systems, the two components of binary mixtures exhibit asynchronous melting. The individual melting points strongly depend on particle size. Especially the hopping motion of particles, i.e. the fast transition of a particle from a local potential minimum to a neighboring lattice point, is studied in detail. Based on six fundamental particle arrangements and related escape models, i.e. calculations of the energy barriers, the melting process in binary mixtures is discussed.

References

[1] G. Gompper and M. Schick, in Soft Matter, Complex Colloidal Suspensions Vol. 2 (Wiley, Weinheim, 2006).

[2] V. S. Nikolaev and A. V. Timofeev, Physics of Plasmas, 2021, 28(3): 033704.

Keywords: Binary mixtures; Melting process; Hopping motion; Boundary conditions; Glass-like formation