TY - JOUR
T1 - Vibrational states of glassy and crystalline orthoterphenyl
AU - Tölle, A.
AU - Zimmermann, H.
AU - Fujara, F.
AU - Petry, W.
AU - Schmidt, W.
AU - Schober, H.
AU - Wuttke, J.
PY - 2000/7/1
Y1 - 2000/7/1
N2 - 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.
AB - 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.
KW - 61.43.Fs Glasses
KW - 63.20.-e Phonons in crystal lattice
KW - 63.50.+x Vibrational states in disordered systems
UR - http://www.scopus.com/inward/record.url?scp=0042995366&partnerID=8YFLogxK
U2 - 10.1007/s100510070251
DO - 10.1007/s100510070251
M3 - Article
AN - SCOPUS:0042995366
SN - 1434-6028
VL - 16
SP - 73
EP - 80
JO - European Physical Journal B
JF - European Physical Journal B
IS - 1
ER -