Volume 88, Number 6, December 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 December 2009|
Effect of cationic disorder on the spin polarization in FeMo double perovskites
Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofísica, Sede Michoacán, Universidad Nacional Autónoma de México - Morelia, México
2 Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México - Apartado Postal 70-360, 04510 México D. F., México
3 Institut Néel, CNRS and Université Joseph Fourier - BP 166, 38042 Grenoble Cedex 9, France, EU
Corresponding author: firstname.lastname@example.org
Accepted: 20 November 2009
Ordered Sr2FeMoO6 is expected to have complete spin polarization, however all samples usually present some degree of Fe/Mo disorder which reduces the tunneling magnetoresistance in granular samples. It can be inferred that disorder is detrimental to the half-metallicity. We present an electronic approach of this disorder using a model based on a correlated electron picture with localized Fe-spins and conduction electrons interacting with the local spins via a double-exchange–type mechanism. This succeeds in stabilizing a ferromagnetic ground state in the absence of disorder. Disorder is treated within the dynamical mean-field approach which is equivalent to the coherent potential approximation. We shall show how electron disorder affects the density of states and the ground-state properties with a particular emphasis on the spin polarization.
PACS: 72.25.-b – Spin polarized transport / 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EPLA, 2009
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