https://doi.org/10.1140/epjb/e2005-00386-9
Ferromagnetic transition in ordered double perovskites and related alloys
1
Instituto de Investigaciones en Materiales, UNAM,
Apartado Postal 70-360, 04510 México D.F., México
2
Instituto Balseiro, Centro Atómico Bariloche, 8400 San Carlos de Bariloche, Argentina
3
Laboratoire d'Études des Propriétés Électroniques
des Solides, CNRS, BP 166, 38042 Grenoble, France
Corresponding author: a navarro@servidor.unam.mx
Received:
23
November
2004
Revised:
6
September
2005
Published online:
16
December
2005
We study the electronic and magnetic properties of ordered perovskites Sr
FeMO
(where M is a transition metal), among which
some compounds, like Sr
FeMoO are half-metallic
with high Curie temperature while SrFeWO 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 SrFeMoxW
O
compounds which present a magnetic and metal-insulator transition as a
function of doping.
PACS: 75.47.Gk – Colossal magnetoresistance / 75.10.-b – General theory and models of magnetic ordering / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
