Eur. Phys. J. B 48, 179-187 (2005)
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

Abstract

We study the electronic and magnetic properties of ordered perovskites SrFeMO (where M is a transition metal), among which some compounds, like SrFeMoO 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 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 SrFeMo_xWO compounds which present a magnetic and metal-insulator transition as a function of doping.