Vibrational States of Glassy and Crystalline Orthotherphenyl

Details Vibrational States of Glassy and Crystalline Orthotherphenyl Vibrational States of Glassy and Crystalline Orthotherphenyl

2000-02-18

arxiv.org/abs/cond-mat/0002292v1

Eur. Phys. J. B 16, 73 (2000)

Physics

Condensed Matter

Statistical Mechanics

7 pages of LaTeX (svjour), 2 tables, 10 figures accepted in Eur. Phys. J. B

Scientific paper

10.1007/s100510070251

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.

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