Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2005-04-28
Physics
Condensed Matter
Soft Condensed Matter
4 pages, 3 figures
Scientific paper
10.1063/1.2085030
We present extensive molecular dynamics simulations of a liquid of symmetric dumbbells, for constant packing fraction, as a function of temperature and molecular elongation. For large elongations, translational and rotational degrees of freedom freeze at the same temperature. For small elongations only the even rotational degrees of freedom remain coupled to translational motions and arrest at a finite common temperature. The odd rotational degrees of freedom remain ergodic at all investigated temperature and the temperature dependence of the corresponding characteristic time is well described by an Arrhenius law. Finally, we discuss the evidence in favor of the presence of a type-A transition temperature for the odd rotational degrees of freedom, distinct from the type-B transition associated with the arrest of the translational and even rotational ones, as predicted by the mode-coupling theory for the glass transition.
Chong Song-Ho
Kob Walter
Moreno Angel J.
Sciortino Francesco
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