Dresden 2014 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 22: Slow Dynamics in Glasses and Granular Matter I (Joint Focus Session with DY and CPP)
DF 22.6: Vortrag
Donnerstag, 3. April 2014, 11:30–11:45, HÜL 186
Glass Transition of Yukawa Systems: Crossover from Hard Sphere to Soft Sphere Limits — •Anoosheh Yazdi1, Alexei Ivlev2, Sergei Khrapak2, Adam Wysocki3, Hartmut Löwen4, and Matthias Sperl1 — 1Institut für Materialphysik im Weltraum, Deutsches Zentrum fuer Luft- und Raumfahrt, 51147 Köln, Germany — 2Max-Planck-Institut für extraterrestrische Physik, 85741 Garching, Germany — 3Institute for Advanced Simulation and Institute of Complex Systems, Forschungszentrum Jülich, 52425 Jülich, Germany — 4Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, 85741 Düsseldorf, Germany
The mode-coupling theory for ideal glass transitions (MCT) is applied to the single and double Yukawa potential systems. Glass transition curves are obtained in the full range of two control parameters: the screening parameter κ, which is the inverse screening length, and the interparticle potential strength Γ. With increasing κ along the transition, glass form factors and effective packing fractions undergo a crossover from the one-component plasma (OCP) limit, which resembles a very soft sphere system, to a hard sphere system (HSS). The entire transition diagram can be described by analytical functions. Suprisingly and different from those of other potentials, glass transition curves are found to be shifted but otherwise identical to the melting curves in the control parameter plane.