Reference : Mapping of Microwave-Induced Phonons by µ-Brillouin Spectroscopy: Hypersons in ZnO on...

	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics Engineering, computing & technology : Materials science & engineering
	To cite this reference:	http://hdl.handle.net/10993/13490

Title :	Mapping of Microwave-Induced Phonons by µ-Brillouin Spectroscopy: Hypersons in ZnO on Silicon
Language :	English
Author, co-author :	Krüger, Jan-Kristian [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Mainka, J. [> >]
	Alnot, Patrick [Laboratoire de Physique des Milieux Ionisés et Applications, CNRS-UMR 7040, Université Henri Poincaré, 54506 Nancy I, France]
	Rouxel, D. [> >]
	Sanctuary, Roland [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Le Brizoual, L. []
	Elmazria, O. []
	Vincent, B. []
Publication date :	2005
Journal title :	Journal de Physique IV
Publisher :	EDP sciences
Volume :	129
Pages :	61-63
Peer reviewed :	Yes
Audience :	International
ISSN :	1155-4339
e-ISSN :	1764-7177
City :	Les Ulis
Country :	France
Abstract :	[en] From the structural point of view a simple Cauchy relation is not expected to hold for isotropic materials. Such a Cauchy relation would imply the reduction of independent elastic stiffness constants for the isotropic state from two to one. However, high frequency elastic data of glasses and viscous liquids show a linear transformation between the shear and the longitudinal elastic stiffness which is called a generalized Cauchy relation. It seems, that the parameters of the linear transformation are related to the global and local symmetry and/or order. Brillouin investigations on the elastic stiffness coefficients of a consolidated nano-crystalline material (CeO2) and of DGEBA/SiO2 nano-composites are used in order to elucidated the role of the discrepancy between local and global symmetry and/or order.
Permalink :	http://hdl.handle.net/10993/13490
DOI :	10.1051/jp4:2005129013

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