Ferromagnetic transition in ordered double perovskites and related alloys

E. Carvajal, O. Navarro (), R. Allub, M. Avignon and B. Alascio

The European Physical Journal B: Condensed Matter and Complex Systems, 2005, vol. 48, issue 2, 179-187

Abstract: We study the electronic and magnetic properties of ordered perovskites Sr 2 FeMO 6 (where M is a transition metal), among which some compounds, like Sr 2 FeMoO 6 are half-metallic with high Curie temperature while Sr 2 FeWO 6 is an antiferromagnetic insulator. Using a double exchange type model with an interaction between localized spins and conduction electrons together with a tight-binding Hamiltonian and the renormalized perturbation expansion method, we study the behavior of T c as a function of the number of conduction electrons and also as a function of the Fe-M energy difference. We also consider the Sr 2 FeMo x W 1-x O 6 compounds which present a magnetic and metal-insulator transition as a function of doping. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Date: 2005
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DOI: 10.1140/epjb/e2005-00386-9

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