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Critical behavior and magnetic entropy change in the La0.6Sr0.4Mn0.8Fe0.1Cr0.1O3 perovskite

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Title: Critical behavior and magnetic entropy change in the La0.6Sr0.4Mn0.8Fe0.1Cr0.1O3 perovskite
Authors: Ben Abdelkhalek, Sonia1 abdk_sonia@yahoo.fr, Kallel, Nabil1, Kallel, Sami1, Peña, Octavio2, Oumezzine, Mohamed1
Source: Journal of Magnetism & Magnetic Materials. Nov2012, Vol. 324 Issue 22, p3615-3619. 5p.
Subjects: Lanthanum compounds, Perovskite, Ceramic materials, Magnetization, Phase transitions, Magnetic fields
Abstract: Abstract: Critical behavior in the La0.6Sr0.4Mn0.8Fe0.1Cr0.1O3 ceramics was studied using magnetization methods. Results show that the paramagnetic–ferromagnetic transition is of second order. Based on the critical behavior analysis using the Banerjee criterion and the Kouvel–Fisher method, we find the critical exponents: β=0.395±0.010, γ=1.402±0.010, and δ=5.208±0.007, for which the magnetic interaction is satisfied within the three-dimensional Heisenberg model. Results indicate the presence of short-range interactions. The magnetic entropy change (−ΔS M) reached maximum values of 1.75, 1.45, 1.15, 0.8 and 0.43JKg−1 K−1 under a magnetic field variation of 5, 4, 3, 2 and 1T, respectively. Nevertheless, these (−ΔS M) values are much low for any potential application at this moment. The nature of this phenomenon is discussed in relation to the characteristics of the magnetic phase transition and critical exponents. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: Critical behavior in the La0.6Sr0.4Mn0.8Fe0.1Cr0.1O3 ceramics was studied using magnetization methods. Results show that the paramagnetic–ferromagnetic transition is of second order. Based on the critical behavior analysis using the Banerjee criterion and the Kouvel–Fisher method, we find the critical exponents: β=0.395±0.010, γ=1.402±0.010, and δ=5.208±0.007, for which the magnetic interaction is satisfied within the three-dimensional Heisenberg model. Results indicate the presence of short-range interactions. The magnetic entropy change (−ΔS M) reached maximum values of 1.75, 1.45, 1.15, 0.8 and 0.43JKg−1 K−1 under a magnetic field variation of 5, 4, 3, 2 and 1T, respectively. Nevertheless, these (−ΔS M) values are much low for any potential application at this moment. The nature of this phenomenon is discussed in relation to the characteristics of the magnetic phase transition and critical exponents. [Copyright &y& Elsevier]
ISSN:03048853
DOI:10.1016/j.jmmm.2012.06.024