Magnetic properties of perovskites La0.7Sr0.3[formula omitted][formula omitted]TixO3: Monte Carlo simulation versus experiments.
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| Title: | Magnetic properties of perovskites La0.7Sr0.3[formula omitted][formula omitted]TixO3: Monte Carlo simulation versus experiments. |
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| Authors: | Yahyaoui, Samia1 yahyaoui.samia@yahoo.fr, Kallel, Sami2 sami_kallel@yahoo.fr, Diep, H.T.3 diep@u-cergy.fr |
| Source: | Journal of Magnetism & Magnetic Materials. Oct2016, Vol. 416, p441-448. 8p. |
| Subjects: | Magnetic properties of perovskite, Lanthanum compounds, Monte Carlo method, Curie temperature, Phase transitions, Molecular interactions |
| Abstract: | This work presents a Monte Carlo study of the phase transition in the perovskites La 0.7 Sr 0.3 Mn 0.7 3+ Mn 0.3- x 4+ Ti x O 3 ( x =0.1, 0.2, and 0.25). We take into account nearest-neighbor (NN) interactions between magnetic ions Mn 3+ ( S =2) and Mn 4+ ( S = 3 / 2 ) using a spin model describing a strong anisotropy on the z -axis. We have calculated the uniform and staggered magnetizations as well as the Edwards–Anderson order parameter as functions of temperature, with and without an applied magnetic field. Fitting the experimental Curie temperature at x =0, we estimated values of various exchange interactions in the system. The dominant one is that between Mn 3+ and Mn 4+ which is at the origin of the ferromagnetic ordering. Effects of the very small interaction J 2 between NN Mn 3+ is analyzed: we show that it can cause an antiferromagnetic phase above T c which disappears at smaller J 2 or at Mn 3+ concentrations smaller than 0.55. Our results show a good agreement with experiments on the magnetizations for substitution concentration x =0.1, 0.2 and 0.3. We also studied the applied-field effect on the magnetization and our obtained results are compared with experiments performed at x = 10 % . [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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