Relaxation and phonons in viscous and glassy orthoterphenyl by neutron scattering

Autor:	Eckhard Bartsch, F. Fujara, M. Kiebel, Hans Sillescu, Joachim Wuttke, Winfried Petry
Rok vydání:	1993
Předmět:	Physics Condensed matter physics Phonon Scattering Incoherent scatter Neutron scattering Condensed Matter Physics Electronic Optical and Magnetic Materials symbols.namesake Mode coupling Density of states symbols Relaxation (physics) General Materials Science van der Waals force
Zdroj:	Zeitschrift f�r Physik B Condensed Matter. 91:357-365
ISSN:	1434-6036 0722-3277
DOI:	10.1007/bf01344065
Popis:	We present an extended set of incoherent neutron scattering measurements on the van der Waals liquido-terphenyl, obtained by time-of-flight and backscattering spectroscopy. In the supercooled liquid regime, data from three instruments are combined and analysed in terms of the selfcorrelationS(Q, t). In the time range 1...100 ps, the crossover from α-to β-relaxation is well described by the masterfunction of mode coupling theory, and fitted parameters are consistent with the previously established critical temperatureT c [Z. Phys. B83, 175 (1991)]. In the glassy regime, vibrations are harmonic and can be described by a density of states. Deviations at lowQ are quantitatively explained by a multiple scattering simulation. Throughout the article, experimental difficulties are discussed in some detail.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::29afe1cd854afac0311821f39378eb0d https://doi.org/10.1007/bf01344065 Zobrazit plný text záznamu Full text from SpringerLink