BOSON PEAKS AND SLOW RELAXATION IN A SIMULATION OF A NETWORK-FORMING IONIC MELT

Citation
M. Foley et al., BOSON PEAKS AND SLOW RELAXATION IN A SIMULATION OF A NETWORK-FORMING IONIC MELT, Philosophical magazine. B. Physics of condensed matter. Structural, electronic, optical and magnetic properties, 71(4), 1995, pp. 557-569
Citations number
27
Categorie Soggetti
Physics, Applied
ISSN journal
09586644
Volume
71
Issue
4
Year of publication
1995
Pages
557 - 569
Database
ISI
SICI code
0958-6644(1995)71:4<557:BPASRI>2.0.ZU;2-D
Abstract
Results are presented for the dynamical properties of a computer simul ation model which has previously been shown to reproduce the distincti ve structural characteristics of the intermediate-strength liquid glas s former ZnCl2. Slow structural relaxation of the density on the lengt h scale of the intermediate-range order is demonstrated, and the impli cations of this finding for theories of the glass transition in networ k-forming liquids are discussed qualitatively. A strong boson peak dev elops in the self-dynamic structure factor (incoherent neutron scatter ing) as the fluid is supercooled. Its presence is traced to the densit y of states (spectral density of the velocity autocorrelation function ) and also to the intermediate scattering function.