Increase of Curie temperature with La doping in the double perovskite Sr2-LayFeMoO6 within an electronic correlation approach

Authors

  • Francisco Estrada Chávez Instituto de Investigacione en Materiales, UNAM Campus Morelia.
  • E. J. Guzmán Instituto de Investigaciones en Materiales, UNAM Unidad Morelia
  • Bertha Aguilar Instituto de Geofísica, UNAM Unidad Michoacán
  • Oracio Navarro Instituto de Investigaciones en Materiales, UNAM Unidad Morelia
  • Michel Avignon CNRS Centre National de la Recherche Scientifique

DOI:

https://doi.org/10.31349/RevMexFis.64.145

Abstract

The double perovskite compound Sr2FeMoO6 has a half-metallic ferromagnetic character and a
high Curie temperature (420 K). Fe-Mo usually present some degree of disorder in either Fe or
Mo ions, it is therefore fundamental to understand the role of electronic and structural parameters
controlling the half-metallic character together with a Curie temperature as high as possible. We replaced
divalent Sr2+ by trivalent La3+ ions in Sr2FeMoO6 system to observe the Curie temperature
behavior. We present an electronic approach using the Green's functions and the renormalization
perturbation expansion method, with localized Fe-spins and conduction Mo-electrons interacting
with the local spins via a double-exchange-type mechanism. We also include the electronic correlations
among the conduction electrons within a mean-eld approximation. Our results show
the density of states and the Curie temperature behavior when La concentration increases for the
Sr2y-yLayFeMoO6 system

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Published

2018-03-14

How to Cite

[1]
F. Estrada Chávez, E. J. Guzmán, B. Aguilar, O. Navarro, and M. Avignon, “Increase of Curie temperature with La doping in the double perovskite Sr2-LayFeMoO6 within an electronic correlation approach”, Rev. Mex. Fís., vol. 64, no. 2 Mar-Apr, pp. 145–149, Mar. 2018.

Issue

Vol. 64 No. 2 Mar-Apr (2018): Revista Mexicana de Física

Section

05 Condensed Matter

License

Authors retain copyright and grant the Revista Mexicana de Física right of first publication with the work simultaneously licensed under a CC BY-NC-ND 4.0 that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.