title: Short-range-order lifetime and the "boson peak" in a metallic glass model.
abstract: We extend the usual static view of short range order in metallic glasses to a dynamical model of local order. We use an atomistic simulation of a NiZr glass to investigate time-dependent fluctuations of the atomic environment. We show that, even in the "frozen" glass, the solute-centered clusters change their identities between distinct polyhedron types. The frequency spectrum of these transitions exhibits a characteristic peak which we show to be related to a universal vibrational anomaly of disordered solids: the controversial boson peak.
authors.affiliation: Institut für Materialphysik, Universität Göttingen, 37077 Göttingen, Germany. hamid@ump.gwdg.de
authors.forename: M
authors.initials: M
authors.lastname: Guerdane
authors.forename: H
authors.initials: H
authors.lastname: Teichler