Study of the Magnetic Properties and Phase Transitions of Sr2CrMoO6 by Mean-Field Approximation

The magnetic properties and phase diagrams of the ordered Sr2CrMoO6 double-perovskite are studied, using the mean-field approximation (MFA) in the framework of Ising model. Sr2CrMoO6 is a half-metallic compound with high magnetoresistance at room temperature. The perfect Sr2CrMoO6 crystallizes in a cubic structure with Fm3m space group. It is shown that the antiferromagnetic coupling between Cr3+S=32\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$^{3+} \left (S =\frac {3}{2}\right )$\end{document} and Mo5+σ=12\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$^{5+} \left (\sigma = \frac {1}{2}\right )$\end{document} ions leads to the stable ferrimagnetic state of Sr2CrMoO6. At the finite temperatures, the magnetizations and phase diagrams are studied for different ranges of the system parameters, namely, the reduced crystal-field parameter and reduced exchange couplings, including some known experimental values. A compensation phenomenon has been observed for some values well-determined of the system parameters, where the reduced compensation temperatures were reached below of the reduced critical ones.