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

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Abstract

We have studied the effect of cationic disorder on the spin polarization of the double perovskite system Sr2Fe1+x Mo1−x O6 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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Authors and Affiliations

  1. Institut Néel, CNRS and Université Joseph Fourier, BP 166, 38042, Grenoble Cedex 9, France

    J. R. Suárez & M. Avignon

  2. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70-360, 04510, México D. F., México

    F. Estrada & O. Navarro

  3. Centro de Investigación en Materiales Avanzados, S. C., Miguel de Cervantes 120, Complejo Industrial Chihuahua, 31109, Chihuahua Chih., México

    F. Estrada

Authors
  1. J. R. Suárez
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  2. F. Estrada
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  3. O. Navarro
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  4. M. Avignon
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Correspondence to J. R. Suárez.

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Suárez, J.R., Estrada, F., Navarro, O. et al. Magnetic properties of the ordered and disordered double perovskite Sr2Fe1+xMo1−xO6 (−1 ≤ x ≤ 1/3). Eur. Phys. J. B 84, 53–58 (2011). https://doi.org/10.1140/epjb/e2011-20647-2

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  • DOI: https://doi.org/10.1140/epjb/e2011-20647-2

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