Eur. Phys. J. Special Topics 189, 141-145 (2010)
https://doi.org/10.1140/epjst/e2010-01316-x

Regular Article

Localization phenomena in models of ion-conducting glass formers

¹ Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany
² Zukunftskolleg und Fachbereich Physik, Universität Konstanz, Postfach 702, 78457 Konstanz, Germany
³ Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, OX1 3NP, Oxford, UK
⁴ Max-Planck-Institut für Metallforschung, Heisenbergstraße 3, 70569 Stuttgart, Germany
⁵ Institut für Theoretische Physik, Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen, Germany
⁶ Arnold Sommerfeld Center for Theoretical Physics (ASC) and Center for NanoScience (CeNS) Fakultät für Physik, Ludwig-Maximilians-Universität München, Theresienstraße 37, 80333 München, Germany
⁷ Institut für Theoretische und Angewandte Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

^a e-mail: juergen.horbach@dlr.de

Received: 1 September 2010
Revised: 14 September 2010
Published online: 12 November 2010

Abstract

The mass transport in soft-sphere mixtures of small and big particles as well as in the disordered Lorentz gas (LG) model is studied using molecular dynamics (MD) computer simulations. The soft-sphere mixture shows anomalous small-particle diffusion signifying a localization transition separate from the big-particle glass transition. Switching off small-particle excluded volume constraints slows down the small-particle dynamics, as indicated by incoherent intermediate scattering functions. A comparison of logarithmic time derivatives of the mean-squared displacements reveals qualitative similarities between the localization transition in the soft-sphere mixture and its counterpart in the LG. Nevertheless, qualitative differences emphasize the need for further research elucidating the connection between both models.