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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2013

Inverse Meyer-Neldel behavior for activated processes in model glasses

P. Koziatek
  • Fonction : Auteur
J.L. Barrat
  • Fonction : Auteur

Résumé

The activation-relaxation technique is used to explore the distribution of escape times from metastable minima of a model metallic glass, estimated using the harmonic transition state theory. We investigate in particular the distribution of attempt frequencies and find that these prefactors are distributed over a range of almost ten orders of magnitude, in stark contrast with the common assumption that they are given by a typical vibrational frequency. Moreover, the typical attempt frequencies appear to decrease with increasing barrier energy, a behavior inverse to the so-called Meyer-Neldel rule observed in many processes with apparent Arrhenius behavior. When combined with a multiple-hop analysis that takes into account the multiplicity of possible transitions, a direct Meyer-Neldel behavior is recovered, albeit with a reduced characteristic prefactor

Domaines

Matériaux

Dates et versions

hal-00850235 , version 1 (05-08-2013)

Identifiants

Citer

P. Koziatek, J.L. Barrat, P. Derlet, D. Rodney. Inverse Meyer-Neldel behavior for activated processes in model glasses. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 87 (22), ⟨10.1103/PhysRevB.87.224105⟩. ⟨hal-00850235⟩
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