Effect of the simultaneous substitution of two transition metals on the structural, magnetic and electrical properties of La0.6Sr0.4Mn1−2xCrxFexO3 - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2010

Effect of the simultaneous substitution of two transition metals on the structural, magnetic and electrical properties of La0.6Sr0.4Mn1−2xCrxFexO3

Sonia Ben Abdelkhalek
  • Fonction : Auteur
Nabil Kallel
  • Fonction : Auteur
Sami Kallel
  • Fonction : Auteur
Thierry Guizouarn
  • Fonction : Auteur
  • PersonId : 917885
Mohamed Oumezzine
  • Fonction : Auteur

Résumé

The structural, magnetic and electrical properties of Cr and Fe simultaneously substituted in the perovskite La0.6Sr0.4Mn1−2xCrxFexO3 have been studied. The presence of Cr and Fe had no significant effect on the structural properties. Curie temperature and saturation magnetization decrease with increase in Cr and Fe contents. For x=0.20 and 0.25, a steep drop of zero field-cooled (ZFC) magnetization at low temperature signifies the formation of cluster- or spin-glass state. A weak hysteresis at low fields seems to be an indication of phase separation. All the resulting magnetization curves can be explained by a superposition of both ferromagnetic and antiferromagnetic components. All the samples are semiconducting throughout the temperature range studied. Resistivity can be described by the adiabatic small polaron hopping and the variable range hopping model. It was found that the transport mechanism is dominated by the VRH model with an increase of Mott localization energy, which explains the increase of resistivity.

Domaines

Matériaux

Dates et versions

hal-00832322 , version 1 (10-06-2013)

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Sonia Ben Abdelkhalek, Nabil Kallel, Sami Kallel, Thierry Guizouarn, Octavio Peña, et al.. Effect of the simultaneous substitution of two transition metals on the structural, magnetic and electrical properties of La0.6Sr0.4Mn1−2xCrxFexO3. Journal of Magnetism and Magnetic Materials, 2010, 322 (21), pp.3416-3422. ⟨10.1016/j.jmmm.2010.06.038⟩. ⟨hal-00832322⟩
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