Mode-coupling glasses and liquid structure

Condensed Matter lunchtime seminar

Mode-coupling glasses and liquid structure

  • Event time: 1:00pm
  • Event date: 13th February 2006
  • Speaker: Martin Greenall (University of Edinburgh)
  • Location: Room 2511,

Event details

I will present mode-coupling theory results quantifying the sensitivity of arrest in a glass-former to its structure.
In a wide range of glass-formers, we find a strong response to density modulations on length scales of order twice the nearest neighbour spacing. Such structure has been seen in recent experiments and simulations on glass-formers including silica melts and aromatic compounds. We interpret its effect on the glass transition in terms of an extension of the 'cage' picture.
In glasses with stronger short-ranged attraction, this response to packing effects is very much weaker. We also find a marked shortening of characteristic length-scales. Both of these results are in line with the picture of these glasses as dominated by short-ranged bonding.

M. J. Greenall, Th. Voigtmann, P. Monthoux and M. E. Cates, cond-mat/0512028

This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..

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