Sperl, Matthias and Zaccarelli, E. and Sciortino, F. and Stanley, H.E. (2010) Disconnected Glass-Glass Transitions and Diffusion Anomalies in a Model with Two Repulsive Length Scales. Physical Review Letters. DOI: 10.1103/PhysRevLett.104.145701.
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Official URL: http://link.aps.org/doi/10.1103/PhysRevLett.104.145701
Building on mode-coupling-theory calculations, we report a novel scenario for multiple glass transitions in a purely repulsive spherical potential: the square shoulder. The liquid-glass transition lines exhibit both melting by cooling and melting by compression as well as associated diffusion anomalies, similar to the ones observed in water. Differently from all previously investigated models, we find for small shoulder widths a glass-glass line that is disconnected from the liquid phase. Upon increasing the shoulder width such a glass-glass line merges with the liquid-glass transition lines, featuring two distinct end point singularities that give rise to logarithmic decays in the dynamics. We analytically explain these findings by considering the interplay of different repulsive length scales.
|Title:||Disconnected Glass-Glass Transitions and Diffusion Anomalies in a Model with Two Repulsive Length Scales|
|Date:||5 April 2010|
|Journal or Publication Title:||Physical Review Letters|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Keywords:||mode-coupling theory for glassy water|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W SY - Technik für Raumfahrtsysteme|
|DLR - Research area:||Space|
|DLR - Program:||W SY - Technik für Raumfahrtsysteme|
|DLR - Research theme (Project):||W - Projekt MAPHEUS (old)|
|Institutes and Institutions:||Institute of Materials Physics in Space|
|Deposited By:||Matthias Sperl|
|Deposited On:||08 Nov 2010 08:19|
|Last Modified:||07 Feb 2013 20:39|
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