Ferromagnetic transition in ordered double perovskites and related alloys
Por:
Carvajal E., Navarro O., Allub R., Avignon M., Alascio B.
Publicada:
1 ene 2005
Resumen:
We study the electronic and magnetic properties of ordered perovskites Sr 2FeMO6 (where M is a transition metal), among which some compounds, like Sr2FeMoO6 are half-metallic with high Curie temperature while Sr2FeWO6 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 Tc as a function of the number of conduction electrons and also as a function of the Fe-M energy difference. We also consider the Sr2FeMoxW1-xO6 compounds which present a magnetic and metal-insulator transition as a function of doping.
Filiaciones:
Carvajal E.:
Instituto de Investigaciones en Materiales, UNAM, Apartado Postal 70-360, 04510 México D.F., Mexico
Navarro O.:
Instituto de Investigaciones en Materiales, UNAM, Apartado Postal 70-360, 04510 México D.F., Mexico
Allub R.:
Instituto Balseiro, Centro Atómico Bariloche, 8400 San Carlos de Bariloche, Argentina
Avignon M.:
Laboratoire d'Études des Propriétés Électroniques des Solides, CNRS, BP 166, 38042 Grenoble, France
Alascio B.:
Instituto Balseiro, Centro Atómico Bariloche, 8400 San Carlos de Bariloche, Argentina
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