Magnetic properties of perovskites La$_{0.7}$Sr$_{0.3}$Mn$_{0.7}^{3+}$Mn$_{0.3-x}^{4+}$Ti$_x$O$_3$:Monte Carlo simulation versus experiments

Samia Yahyaoui; Sami Kallel; H. T. Diep

doi:10.1016/j.jmmm.2016.05.037

paper

Magnetic properties of perovskites La $_{0.7}$ Sr $_{0.3}$ Mn $_{0.7}^{3 +}$ Mn $_{0.3 - x}^{4 +}$ Ti $_{x}$ O $_{3}$ :Monte Carlo simulation versus experiments

arXiv:1605.05107 · doi:10.1016/j.jmmm.2016.05.037

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 accountnearest-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 $x = 10%$ .

arXiv commentTo appear in J. Mag. Magn. Materials

Magnetic properties of perovskites La $_{0.7}$ Sr $_{0.3}$ Mn $_{0.7}^{3 +}$ Mn $_{0.3 - x}^{4 +}$ Ti $_{x}$ O $_{3}$ :Monte Carlo simulation versus experiments

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Magnetic properties of perovskites La0.7​Sr0.3​Mn0.73+​Mn0.3−x4+​Tix​O3​:Monte Carlo simulation versus experiments

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Magnetic properties of perovskites La $_{0.7}$ Sr $_{0.3}$ Mn $_{0.7}^{3 +}$ Mn $_{0.3 - x}^{4 +}$ Ti $_{x}$ O $_{3}$ :Monte Carlo simulation versus experiments