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Dynamic anomaly in the glass transition region of orthoterphenyl

A neutron scattering study

  • Published:
Zeitschrift für Physik B Condensed Matter

Abstract

We report on incoherent and coherent neutron scattering results in the supercooled liquid and the glassy regime of the van der Waals fluido-terphenyl using the backscattering and spin echo technique, respectively. A critical comparison of both techniques is presented. The data are analysed in the time domain assuming that microscopic correlation times (τ) scale with the viscosity η according to τ(T)∼η(T)/T. With this assumption we obtain an agreement with several predictions of mode coupling theory: the existence of a critical temperatureT c is shown, independently for both incoherent and coherent data, by a cusp in the temperature dependence of the Debye-Waller factorf Q (T). BelowT c fQ(T) follows the predicted\(\sqrt {T_c - T} \) behaviour yielding also theQ-dependence of the critical parametersf cQ andh Q . AboveT c the α-process or structural relaxation can be well parametrized by a stretched exponential function. In accordance with theory the structural relaxation curves can also be described by a power law with a critical (von Schweidler) exponentb=0.525±0.10.

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Authors and Affiliations

  1. Institut Laue-Langevin, 156X, F-38042, Grenoble Cedex, France

    W. Petry & B. Farago

  2. Institut für Physikalische Chemie der Universität, Jakob-Welder-Weg 15, W-6500, Mainz, Federal Republic of Germany

    E. Bartsch, F. Fujara, M. Kiebel & H. Sillescu

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  1. W. Petry
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  2. E. Bartsch
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  3. F. Fujara
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  4. M. Kiebel
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  5. H. Sillescu
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  6. B. Farago
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Petry, W., Bartsch, E., Fujara, F. et al. Dynamic anomaly in the glass transition region of orthoterphenyl. Z. Physik B - Condensed Matter 83, 175–184 (1991). https://doi.org/10.1007/BF01309415

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  • DOI: https://doi.org/10.1007/BF01309415

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