Dynamic phase transitions in La2/3Ca1/3MnO3 manganites: A Monte Carlo simulation study

This work presents a study of dynamic phase transitions in samples of perovskite type manganites of La2/3Ca1/3MnO3, when they were submitted to the influence of an external magnetic field that includes both a time dependent and a time independent magnetic fields. This study was carried out based on Monte Carlo simulations and using the Metropolis algorithm and the mixed spin Ising model. Exchange parameters are proposed to simulate this material. These exchange parameters were obtained in order to reproduce the critical temperature for La2/3Ca1/3MnO3. Results showed that it exists a competition between different factors that generate order or disorder in the magnetic behavior of that material. It was observed that, as the time independent field increases, the critical temperature increases. Moreover, simulations showed that as the amplitude or the period of the time dependent magnetic field increases, the critical temperature decreases. This behavior allows to assert that an time dependent magnetic field induced disorder while a time independent field induces order. (C) 2018 Elsevier B.V. All rights reserved.