18 research outputs found
On the relationship between structure and dynamics in a supercooled liquid
We present the dynamic propensity distribution as an explicit measure of the
degree to which the dynamics in a liquid over the time scale of structural
relaxation is determined by the initial configuration. We then examine, for a
binary mixture of soft discs in two dimensions, the correlation between the
spatial distribution of propensity and that of two localmeasures of
configuration structure: the local composition and local free volume. While the
small particles dominate the high propensity population,we find no strong
correlation between either the local composition or the local free volume and
the propensity. It is argued that this is a generic failure of purely local
structural measures to capture the inherently non-local character of collective
behaviour.Comment: Published, see below or
http://www.iop.org/EJ/abstract/0953-8984/17/49/001/ Editing comments have
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Estudo de caso na engenharia de produção: estruturação e recomendações para sua condução
STRUCTURE OF Er | Y SUPERLATTICES
The magnetic structure of Er | Y superlattices has been determined by neutron diffraction and squid magnetometry on single crystal samples grown on sapphire substrates by molecular-beam-epitaxy techniques. The turn angle in the Er layers is magneto-elastically "clamped", and in fact locks-in to the commensurate state ω = 2π / 7 below about 35 K. For the [Er13 | Y26] superlattice the low temperature state is not 2π / 7 but can be shifted to that value by a magnetic field, since this state has a net moment of 8 µB / 7 atoms along the c-axis