Excess wing in glass-forming glycerol and LiCl-glycerol mixtures detected by neutron scattering

  • S. Gupta
  • N. Arend
  • P. Lunkenheimer
  • A. Loidl
  • L. Stingaciu
  • N. Jalarvo
  • E. Mamontov
  • M. Ohl
Open Access
Regular Article

Abstract.

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.

Keywords

Flowing Matter: Liquids and Complex Fluids 

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Copyright information

© The Author(s) 2015

Authors and Affiliations

  • S. Gupta
    • 1
  • N. Arend
    • 1
    • 2
  • P. Lunkenheimer
    • 3
  • A. Loidl
    • 3
  • L. Stingaciu
    • 1
  • N. Jalarvo
    • 1
  • E. Mamontov
    • 4
  • M. Ohl
    • 1
  1. 1.Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbHOutstation at SNS-Oak Ridge National Laboratory (ORNL)Oak RidgeUSA
  2. 2.Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbHOutstation at MLZGarchingGermany
  3. 3.Experimental Physics V, Center for Electronic Correlations and MagnetismUniversity of AugsburgAugsburgGermany
  4. 4.SNS, Neutron Sciences DirectorateOak Ridge National Laboratory (ORNL)Oak RidgeUSA

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