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Title: Precursor phenomena in frustrated systems
Author: Franzese, Giancarlo
Coniglio, Antonio, 1940-
Keywords: Física estadística
Física matemàtica
Mecànica estadística
Materials magnètics
Model d'Ising
Statistical physics
Mathematical physics
Statistical mechanics
Magnetic materials
Ising model
Issue Date: 1999
Publisher: The American Physical Society
Abstract: To understand the origin of the dynamical transition, between high-temperature exponential relaxation and low-temperature nonexponential relaxation, that occurs well above the static transition in glassy systems, a frustrated spin model, with and without disorder, is considered. The model has two phase transitions, the lower being a standard spin glass transition (in the presence of disorder) or fully frustrated Ising (in the absence of disorder), and the higher being a Potts transition. Monte Carlo results clarify that in the model with (or without) disorder the precursor phenomena are related to the Griffiths (or Potts) transition. The Griffiths transition is a vanishing transition which occurs above the Potts transition and is present only when disorder is present, while the Potts transition which signals the effect due to frustration is always present. These results suggest that precursor phenomena in frustrated systems are due either to disorder and/or to frustration, giving a consistent interpretation also for the limiting cases of Ising spin glass and of Ising fully frustrated model, where also the Potts transition is vanishing. This interpretation could play a relevant role in glassy systems beyond the spin systems case.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 1999, vol. 59, núm. 6, p. 6409-6412
Related resource:
ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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