Issue
EPL
Volume 77, Number 5, March 2007
Article Number 56002
Number of page(s) 5
Section Condensed Matter: Structural, Mechanical and Thermal Properties
DOI http://dx.doi.org/10.1209/0295-5075/77/56002
Published online 15 February 2007
EPL, 77 (2007) 56002
DOI: 10.1209/0295-5075/77/56002

Direct identification of the glass transition: Growing length scale and the onset of plasticity

E. Aharonov1, E. Bouchbinder2, H. G. E. Hentschel3, V. Ilyin2, N. Makedonska1, I. Procaccia2 and N. Schupper2

1  Department of Environmental Sciences and Energy, Weizmann Institute of Science - Rehovot 76100, Israel
2  The Department of Chemical Physics, The Weizmann Institute of Science - Rehovot 76100, Israel
3  Department of Physics, Emory University - Atlanta, Georgia 30322


received 30 November 2006; accepted in final form 3 January 2007; published March 2007
published online 15 February 2007

Abstract
Understanding the mechanical properties of glasses remains elusive since the glass transition itself is not fully understood, even in well-studied examples of glass formers in two dimensions. In this context we demonstrate here: i) a direct evidence for a diverging length scale at the glass transition ii) an identification of the glass transition with the disappearance of fluid-like regions and iii) the appearance in the glass state of fluid-like regions when mechanical strain is applied. These fluid-like regions are associated with the onset of plasticity in the amorphous solid. The relaxation times which diverge upon the approach to the glass transition are related quantitatively to the diverging length scale.

PACS
61.43.Hv - Fractals; macroscopic aggregates (including diffusion-limited aggregates).
05.45.Df - Fractals.
05.70.Fh - Phase transitions: general studies.

© Europhysics Letters Association 2007