Determination of the spontaneous magnetization by analysis of the magnetic entropy change in La0.40Nd0.30Sr0.30Mn0.70Cr0.30O3 - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Journal of Alloys and Compounds Année : 2010

Determination of the spontaneous magnetization by analysis of the magnetic entropy change in La0.40Nd0.30Sr0.30Mn0.70Cr0.30O3

Sami Kallel
  • Fonction : Auteur
Nabil Kallel
  • Fonction : Auteur
Mohamed Oumezzine
  • Fonction : Auteur

Résumé

The magnetic phase transition and magnetic entropy change (−ΔSM) in the La0.40Nd0.30Sr0.30Mn0.70Cr0.30O3 perovskite were investigated by measuring the magnetization as a function of temperature. The ferromagnetic transition temperature TC and the critical exponents β and γ, determined by analyzing the Arrott plots, are found to be TC = 191 K, β = 0.433, γ = 1.053 and δ = 3.486. These values for the critical exponents are close to the mean-field values. In order to estimate the spontaneous magnetization Ms(T) at a given temperature, we use a process based on the analysis, in the mean-field theory, of the magnetic entropy change (−ΔSM) versus the magnetization data. An excellent agreement is found between the spontaneous magnetization determined from the entropy change ((−ΔSM) vs. M2) and the classical extrapolation from the Arrott curves (μ0H/M vs. M2), thus confirming that the magnetic entropy is a valid approach to estimate the spontaneous magnetization in this system and in other compounds as well.

Domaines

Matériaux

Dates et versions

hal-00829594 , version 1 (03-06-2013)

Identifiants

Citer

Sami Kallel, Nabil Kallel, Octavio Peña, Mohamed Oumezzine. Determination of the spontaneous magnetization by analysis of the magnetic entropy change in La0.40Nd0.30Sr0.30Mn0.70Cr0.30O3. Journal of Alloys and Compounds, 2010, 504 (1), pp.12-15. ⟨10.1016/j.jallcom.2010.05.091⟩. ⟨hal-00829594⟩
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