Increase of Curie temperature with La doping in the double perovskite Sr2-yLayFeMoO6 within an electronic correlation approach
Por:
Guzmán E.J., Estrada F., Aguilar B., Navarro O., Avignon M.
Publicada:
1 mar 2018
Resumen:
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-field approximation. Our results show the density of states and the Curie temperature behavior when La concentration increases for the Sr2-yLayFeMoO6 system. © 2018, Sociedad Mexicana de Fisica.
Filiaciones:
Guzmán E.J.:
Unidad Morelia del Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Antigua carretera a Patzcuaro No 8701, Col. Ex Hacienda de San Jose de la Huerta, Morelia, Michoacán, Mexico
Facultad de Ciencias Físico Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo, Av. F.J. Mújica s/n Cd. Universitaria, Morelia, Michoacán, Mexico
Estrada F.:
Unidad Morelia del Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Antigua carretera a Patzcuaro No 8701, Col. Ex Hacienda de San Jose de la Huerta, Morelia, Michoacán, Mexico
Facultad de Biología, Universidad Michoacana de San Nicolás de Hidalgo, Av. F.J. Mújica s/n Cd. Universitaria, Morelia, Michoacán, Mexico
Aguilar B.:
Unidad Morelia del Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Antigua carretera a Patzcuaro No 8701, Col. Ex Hacienda de San Jose de la Huerta, Morelia, Michoacán, Mexico
Unidad Michoacán del Instituto de Geofísica, Universidad Nacional Autónoma de México, Antigua carretera a Patzcuaro No 8701, Col. Ex Hacienda de San Jose de la Huerta, Morelia, Michoacán, Mexico
Navarro O.:
Unidad Morelia del Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Antigua carretera a Patzcuaro No 8701, Col. Ex Hacienda de San Jose de la Huerta, Morelia, Michoacán, Mexico
Avignon M.:
Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France
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