Dynamics in viscous orthoterphenyl: Results from coherent neutron scattering

E. Bartsch, F. Fujara, J. F. Legrand, W. Petry, H. Sillescu, J. Wuttke

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Abstract

We have measured coherent neutron scattering from deuterated orthoterphenyl on a spin echo and a backscattering spectrometer. In agreement with mode coupling theory, pair correlations decay in two steps and follow the same scaling laws as those found previously for self-correlations. The temperature evolution of the intermediate plateau is compatible with the previously established Tc=290 K. The spatial resolution has not been sufficient to fully resolve oscillations of parameters as functions of Q, which are predicted by mode coupling theory. Within this limitation, we find that the double peak structure of S(Q) is not expressed in the nonergodicity parameter fQc and that the de Gennes narrowing is missing.

Original languageEnglish
Pages (from-to)738-745
Number of pages8
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume52
Issue number1
DOIs
StatePublished - 1995

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