Magnetic properties of the ordered and disordered double perovskite Sr2Fe1+xMo1−xO6 (−1 ≤ x ≤ 1/3)

被引：0
作者：
J. R. Suárez
F. Estrada
O. Navarro
M. Avignon
机构：
[1] Institut Néel,Instituto de Investigaciones en Materiales
[2] CNRS and Université Joseph Fourier,undefined
[3] Universidad Nacional Autónoma de México,undefined
[4] Centro de Investigación en Materiales Avanzados,undefined
[5] S. C.,undefined
[6] Miguel de Cervantes 120,undefined
[7] Complejo Industrial Chihuahua,undefined
来源：
The European Physical Journal B | 2011年 / 84卷
关键词：
Spin Polarization; Itinerant Electron; Double Perovskite; Tunneling Magnetoresistance; Cationic Disorder;
D O I：
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学科分类号：
摘要：
We have studied the effect of cationic disorder on the spin polarization of the double perovskite system Sr2Fe1+xMo1−xO6 with  −1 ≤ x ≤ 1/3. The composition x = 0 corresponds to the well-known double-perovskite Sr2FeMoO6, which is expected to have complete spin polarization, however all samples present some degree of Fe/Mo disorder which reduces the tunneling magnetoresistance in granular samples. We consider an electronic model within the renormalized perturbation expansion Green’s functions, consisting in a correlated electron picture with localized Fe-ions and itinerant electrons interacting with the local spins via a double-exchange type mechanism. Our results show the influence of disorder on the density of states and the ground-state properties, particularly on the spin polarization over the whole range of x.
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页码：53 / 58
页数：5
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