https://doi.org/10.1140/epje/i2015-15001-0
Regular Article
Excess wing in glass-forming glycerol and LiCl-glycerol mixtures detected by neutron scattering
1
Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at SNS-Oak Ridge National Laboratory (ORNL), 1 Bethel Valley Road, 37831, Oak Ridge, TN, USA
2
Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ, Lichtenbergstraße 1, 85747, Garching, Germany
3
Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135, Augsburg, Germany
4
SNS, Neutron Sciences Directorate, Oak Ridge National Laboratory (ORNL), 1 Bethel Valley Road, 37831, Oak Ridge, TN, USA
* e-mail: s.gupta@fz-juelich.de
Received:
31
July
2014
Revised:
22
October
2014
Accepted:
2
December
2014
Published online:
22
January
2015
The relaxational dynamics in glass-forming glycerol and glycerol mixed with LiCl is investigated using different neutron scattering techniques. The performed neutron spin echo experiments, which extend up to relatively long relaxation time scales of the order of 10ns, should allow for the detection of contributions from the so-called excess wing. This phenomenon, whose microscopic origin is controversially discussed, arises in a variety of glass formers and, until now, was almost exclusively investigated by dielectric spectroscopy and light scattering. Here we show that the relaxational process causing the excess wing can also be detected by neutron scattering, which directly couples to density fluctuations.
Key words: Flowing Matter: Liquids and Complex Fluids
© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2015