Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DF: Fachverband Dielektrische Festkörper
DF 18: Glasses and Glass Transition I (DY with DF/CPP)
DF 18.2: Vortrag
Donnerstag, 19. März 2015, 15:15–15:30, BH-N 128
Critical-like behaviour in non-crystalline solids caused by angular correlations — •Mariya Rasshchupkyna1,2,3, Volodymyr Bugaev3,4, Johannes Roth5, Gerhard Grübel6,1, and Peter Wochner3,4 — 1The Hamburg Centre for Ultrafast Imaging (CUI) — 2University of Hamburg — 3Max Planck Institute for Intelligent Systems, Stuttgart — 4Max Planck Institute for Solid State Research, Stuttgart — 5Institute for Functional Materials and Quantum Technologies, University of Stuttgart — 6DESY
Modern experimental techniques on the basis of coherent scattering data, such as X-ray cross-correlation analysis (XCCA) [1] allow the direct determination of angular correlations (and their modes) in molecular disordered systems. We performed molecular dynamics (MD) simulations for model systems with Dzugutov-type [2] interaction adjusted for the creation of glassy-type quasi-equilibrium states. XCCA applied to the simulated coherent scattering patterns of the MD samples reveals a four-point dodecagonal dominant mode responsible for the formation of non-commensurate structures, as found in glasses and quasicrystals. Strikingly, this mode exhibits a pronounced temperature-dependence indicating a critical-type behavior in the vicinity of the glassy-type transition.
References
1. P. Wochner, C. Gutt, T. Autenrieth, T. Demmer, V.N. Bugaev, A. D. Ortiz, A. Duri, F. Zontone, G. Grübel, H. Dosch, Proc. Natl. Acad. Sci. USA 106, 11511 (2009).
2. M. Dzugutov, Phys. Rev. Lett. 70, 2924 (1993).