Theory of Half-metallic Ferrimagnetism in Double Perovskites

Abstract

We present a comprehensive theory of the temperature- and disorder-dependence of half-metallic ferrimagnetism in the double perovskite Sr${}_2$FeMoO${}_6$ (SFMO) with $T_c$ above room temperature. We show that the magnetization $M(T)$ and conduction electron polarization $P(T)$ are both proportional to the magnetization $M_S(T)$ of localized Fe spins. We derive and validate an effective spin Hamiltonian, amenable to large-scale three-dimensional simulations. We show how $M(T)$ and $T_c$ are affected by disorder, ubiquitous in these materials. We suggest a way to enhance $T_c$ in SFMO without sacrificing polarization.

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• Phase diagram and influence of defects in the double perovskites
• Mean field theory for double-perovskites
• A Magnetic Model for the Ordered Double Perovskites
• Hidden Symmetries and their Consequences in $t_{2g}$ Cubic Perovskites

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