Avalanches in a fluctuationless first-order phase transition in a random-bond Ising model


Autoria(s): Vives i Santa-Eulàlia, Eduard; Planes Vila, Antoni
Contribuinte(s)

Universitat de Barcelona

Data(s)

04/05/2010

Resumo

We study the behavior of the random-bond Ising model at zero temperature by numerical simulations for a variable amount of disorder. The model is an example of systems exhibiting a fluctuationless first-order phase transition similar to some field-induced phase transitions in ferromagnetic systems and the martensitic phase transition appearing in a number of metallic alloys. We focus on the study of the hysteresis cycles appearing when the external field is swept from positive to negative values. By using a finite-size scaling hypothesis, we analyze the disorder-induced phase transition between the phase exhibiting a discontinuity in the hysteresis cycle and the phase with the continuous hysteresis cycle. Critical exponents characterizing the transition are obtained. We also analyze the size and duration distributions of the magnetization jumps (avalanches).

Identificador

http://hdl.handle.net/2445/9943

Idioma(s)

eng

Publicador

The American Physical Society

Direitos

(c) The American Physical Society, 1994

info:eu-repo/semantics/openAccess

Palavras-Chave #Superfícies (Física) #Transformacions de fase (Física estadística) #Model d'Ising #Surfaces (Physics) #Phase transformations (Statistical physics) #Ising model
Tipo

info:eu-repo/semantics/article