Fragility and Boson Peak formation in a Supercooled Liquid

Details Fragility and Boson Peak formation in a Supercooled Liquid Fragility and Boson Peak formation in a Supercooled Liquid

2001-03-07

arxiv.org/abs/cond-mat/0103158v1

Physics

Condensed Matter

Statistical Mechanics

6 pages, 5 figures

Scientific paper

10.1016/S0375-9601(01)00391-7

We analyze results for the Boson Peak from the neutron time of flight spectroscopy data on Ge-As-Se, and Raman spectra data on m-TCP and OTP, using a recent mode coupling model that takes into account the coupling of density fluctuations with vibrational modes in presence of defects in the supercooled state. From the experimental results for different materials we observe that for more fragile systems characterized by increasing fragility parameter m, a slower relaxation of the defect-density correlation is needed to give rise to the observed peak in the spectra.

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