Vibrational states of glassy and crystalline orthoterphenyl

Tölle, A.; Zimmermann, Herbert; Fujara, F.; Petry, W.; Schmidt, W.; Schober, H.; Wuttke, J.

doi:10.1007/s100510070251

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Vibrational states of glassy and crystalline orthoterphenyl

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Zimmermann, Herbert
Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Tölle, A., Zimmermann, H., Fujara, F., Petry, W., Schmidt, W., Schober, H., et al. (2000). Vibrational states of glassy and crystalline orthoterphenyl. The European Physical Journal B: Condensend Matter Physics, 16(1), 73-80. doi:10.1007/s100510070251.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0028-2AB8-2

Abstract

Low-frequency vibrations of glassy and crystalline orthoterphenyl are studied by means of neutron scattering. Phonon dispersions are measured along the main axes of a single crystal, and the corresponding longitudinal and transversal sound velocities are obtained. For glassy and polycrystalline samples, a density of vibrational states is determined and cross-checked against other dynamic observables. In the crystal, low-lying zone-boundary modes lead to an excess over the Debye density of states. In the glass, the boson peak is located at even lower frequencies. With increasing temperature, both glass and crystal show anharmonicity