Wave-Vector Dependence of the Dynamics in Supercooled Metallic Liquids

Spatially heterogeneous dynamics in supercooled liquids.

Although it has long been recognized that dynamics in supercooled liquids might be spatially heterogeneous, only in the past few years has clear evidence emerged to support this view. As a liquid is cooled far below its melting point, dynamics in some regions of the sample can be orders of magnitude faster than dynamics in other regions only a few nanometers away. In this review, the experiment...

Dynamics of Highly Supercooled Liquids far

We rst review our recent simulation work on dynamic heterogeneity and supercooled liquid rheology. We then treat a supercooled polymer melt to study the stress relaxation function, transient stress evolution, shear-thinning, and elongation of chains.

Icosahedral ordering in supercooled liquids and metallic glasses

Pressure dependence of diffusion in simple glasses and supercooled liquids.

Using molecular dynamics simulation, we have calculated the pressure dependence of the diffusion coefficient in a binary Lennard-Jones glass. We observe four temperature regimes. The apparent activation volume drops from high values in the hot liquid to a plateau value. Near the critical temperature of the mode coupling theory it rises steeply, but in the glassy state we find again small values...

Cohen-Grest model for the dynamics of supercooled liquids.

Recent experiments have established that, at least for van der Waals glass formers, volume fluctuations contribute significantly to the slowing down of the dynamics near T(g). Accordingly, we use the Cohen-Grest (CG) free-volume model to analyze dielectric relaxation data for six van der Waals liquids. The CG equation accurately describes the structural relaxation times over broader ranges of t...