Volume 71, Number 4, August 2005
|Page(s)||563 - 569|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||20 July 2005|
Brillouin neutron scattering of -
INFM CRS-SOFT, c/o Università di Roma “La Sapienza” - I-00185 Roma, Italy
2 Institut Laue Langevin - BP 156, Grenoble, France
3 Dipartimento di Fisica, Università di Trento - I-38050 Povo (Trento), Italy
4 Dipartimento di Fisica, Università di Perugia - Perugia, Italy
5 Departamento de Física, Universidade Federal do Ceará CP 6030, Campus do Pici, 60455-760 Fortaleza, Ceará, Brazil
Accepted: 21 June 2005
The high-frequency dynamics of - was investigated by inelastic neutron scattering. Neutron experiments were carried out by exploiting both three-axis and time-of-flight techniques as most adequate to selectively access to a wider kinematics region or to higher-resolution characteristics. Experimental evidences of a highly dispersing inelastic peak, with an associated velocity of 3650, and an almost dispersionless inelastic structure allowed us to definitely confirm the propagating nature of the high-frequency excitations. The measured data were compared with the results of a molecular-dynamics simulation.
PACS: 42.70.Ce – Glasses, quartz / 25.40.Fq – Inelastic neutron scattering / 73.43.Lp – Collective excitations
© EDP Sciences, 2005
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