Brillouin neutron scattering of -

L. E. Bove; E. Fabiani; A. Fontana; F. Paoletti; C. Petrillo; O. Pilla; I. C. V. Bento

doi:10.1209/epl/i2005-10125-0

All issues

Volume 71 / No 4 (August 2005)

Europhys. Lett., 71 4 (2005) 563-569

Abstract

Issue		Europhys. Lett. Volume 71, Number 4, August 2005


Page(s)		563 - 569
Section		Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
DOI		https://doi.org/10.1209/epl/i2005-10125-0
Published online		20 July 2005

Europhys. Lett., 71 (4), pp. 563-569 (2005)

Brillouin neutron scattering of $\chem{v}$ - $\chem{GeO_2}$

L. E. Bove¹, E. Fabiani², A. Fontana¹^,3, F. Paoletti⁴, C. Petrillo¹^,4, O. Pilla³ and I. C. V. Bento⁵

¹ 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

Received: 22 February 2005
Accepted: 21 June 2005

Abstract

The high-frequency dynamics of $\chem{v}$ - $\chem{GeO_2}$ 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 $\un{m\,s^{-1}}$ , 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

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