Metamagnetic anomalies in the kinetic Ashkin–Teller model

J.P. Santos, G.B.B. Nascimento, V.T.P. Vieira and M.M.G. Costa

Physica A: Statistical Mechanics and its Applications, 2024, vol. 651, issue C

Abstract: This study investigates the metamagnetic anomaly in the Ashkin–Teller spin-1/2 model in a ferromagnetic state, utilizing dynamic mean-field theory on a cubic lattice from a stochastic theory. We analyze instantaneous magnetizations over time, dynamic order parameters, and magnetic susceptibilities concerning the constant bias field, as well as examining dynamic phase diagrams. Our observations reveal that dynamic phase transitions occur at specific points of the constant bias field, where instantaneous magnetization transitions from oscillating between negative and positive states to a strictly positive state. We also observe a narrow region in the dynamic phase diagram between phase transitions of different order parameters of the model, for some conditions among the couplings of these order parameters. These results contribute to an understanding of the dynamic behavior of the spin-1/2 AT model under ferromagnetic conditions, providing interesting insights into phase transitions and the metamagnetic anomaly.

Keywords: Ashkin–Teller spin-1/2 model; Dynamic mean-field theory; Metamagnetic anomaly; Dynamic order parameters; Constant bias field (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:651:y:2024:i:c:s0378437124005260

DOI: 10.1016/j.physa.2024.130017

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