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1994

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/9943

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

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Abstract

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).

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http://dx.doi.org/10.1103/PhysRevB.50.3839

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Superfícies (Física), Transformacions de fase (Física estadística), Model d'Ising

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Surfaces (Physics), Phase transformations (Statistical physics), Ising model

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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VIVES I SANTA-EULÀLIA, Eduard and PLANES VILA, Antoni. Avalanches in a fluctuationless first-order phase transition in a random-bond Ising model. Physical Review B. 1994. Vol. 50, num. 6, pags. 3839-3848. ISSN 0163-1829. [consulted: 5 of October of 2026]. Available at: https://hdl.handle.net/2445/9943

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