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Multiple Glass Singularities and Isodynamics in a Core-Softened Model for Glass-Forming Systems

Gnan, Nicoletta and Das, Gayatri and Sperl, Matthias and Sciortino, Francesco and Zaccarelli, E. (2015) Multiple Glass Singularities and Isodynamics in a Core-Softened Model for Glass-Forming Systems. Physical Review Letters, 113, p. 258302. American Physical Society. DOI: 10.1103/PhysRevLett.113.258302 ISSN 0031-9007

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Official URL: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.113.258302


We investigate the slow dynamics of a simple glass former whose interaction potential is the sum of a hard core and a square shoulder repulsion. According to mode coupling theory, the competition between the two repulsive length scales gives rise to a complex dynamic scenario: besides the fluid-glass line, the theory predicts a glass-glass line in the temperature-packing fraction plane with two end points. Interestingly, for critical values of the square-shoulder parameters, such end points can be accessed from the liquid phase. We verify, via extensive numerical simulations, the existence of both points through the observation of an unconventional subdiffusive/logarithmic dynamical behavior. Unexpectedly, we also discover that the simultaneous presence of two end points generates special loci in the state diagram along which the dynamics is identical at all length and time scales.

Item URL in elib:https://elib.dlr.de/103163/
Document Type:Article
Title:Multiple Glass Singularities and Isodynamics in a Core-Softened Model for Glass-Forming Systems
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sperl, Matthiasmatthias.sperl (at) dlr.deUNSPECIFIED
Sciortino, FrancescoUniv. Roma La SapienzaUNSPECIFIED
Date:1 January 2015
Journal or Publication Title:Physical Review Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1103/PhysRevLett.113.258302
Page Range:p. 258302
Publisher:American Physical Society
Keywords:glass transition
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung (old), R - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Sperl, Matthias
Deposited On:22 Feb 2016 07:20
Last Modified:30 May 2019 22:06

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