Increase of Curie temperature with La doping in the double perovskite Sr_(2−y)La_(y)FeMoO_(6) within an electronic correlation approach

• E.J. Guzmán ^[1] ; F. Estrada ^[1] ; B. Aguilar ^[1] ; O. Navarro ^[1] ; M. Avignon ^[2]
  1. [1] Universidad Nacional Autónoma de México

     Universidad Nacional Autónoma de México

     México

     
  2. [2] Grenoble Alpes University

     Grenoble Alpes University

     Arrondissement de Grenoble, Francia

     
• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 64, Nº. 2, 2018, págs. 145-149
• Idioma: inglés
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• Resumen

  • The double perovskite compound Sr_(2)FeMoO_(6) 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 Sr^(2+) by trivalent La^(3+) ions in Sr_(2)FeMoO_(6) 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-field approximation. Our results show the density of states and the Curie temperature behavior when La concentration increases for the Sr_(2−y)La_(y)FeMoO_(6) system.