Structure and dynamics of a model glass: influence of long-range forces

Details Structure and dynamics of a model glass: influence of long-range forces Structure and dynamics of a model glass: influence of long-range forces

2000-09-06

arxiv.org/abs/cond-mat/0009077v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 4 figures. To be published in J.Phys.: CM

Scientific paper

10.1088/0953-8984/12/41/303

We vary the amplitude of the long-range Coulomb forces within a classical potential describing a model silica glass and study the consequences on the structure and dynamics of the glass, via molecular dynamics simulations. This model allows us to follow the variation of specific features such as the First Sharp Diffraction Peak and the Boson Peak in a system going continuously from a fragile (no Coulomb forces) to a strong (with Coulomb forces) glass. In particular we show that the characteristic features of a strong glass (existence of medium range order, bell-shaped ring size distribution, sharp Boson peak) appear as soon as tetrahedral units are formed.

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