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Modeling the magnetic isotherms of (La0.56Ce0.14)Sr0.30MnO3 by a mean-field scaling method and estimation of magnetic entropy change.

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Title: Modeling the magnetic isotherms of (La0.56Ce0.14)Sr0.30MnO3 by a mean-field scaling method and estimation of magnetic entropy change.
Authors: Yahyaoui, S.1, Khalfaoui, M.1 mohamed_khalfaoui@yahoo.com, Kallel, S.2, Kallel, N.2,3, Amaral, J.S.4,5, Ben Lamine, A.1
Source: Journal of Magnetism & Magnetic Materials. Nov2015, Vol. 393, p105-109. 5p.
Subjects: Magnetic properties of lanthanum strontium manganese oxide, Mean field theory, Magnetic entropy, Perovskite, Equations of state
Abstract: We report a study on the magnetic properties of the (La 0.56 Ce 0.14 )Sr 0.30 MnO 3 perovskite, by a mean-field method. By scaling of the experimental magnetization data, the mean-field exchange parameter λ and the B S function of the equation of state B S [ ( H + H exch ) / T ] are directly determined, as well as the order of the phase transition. The spin quantum number of the manganite has been also determined. The mean-field scaling has been used to estimate magnetic entropy change ( − Δ S M ) within the thermodynamics of the model and without using the usual numerical integration of a Maxwell relation. The maxima of the positive absolute value of ( − Δ S M ) upon variation of the applied magnetic field at 1 and 5 T are about 1.68 and 5.04 J kg −1 K −1 , respectively. Satisfactory agreement between the mean-field model and experimental behavior has been found. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:We report a study on the magnetic properties of the (La 0.56 Ce 0.14 )Sr 0.30 MnO 3 perovskite, by a mean-field method. By scaling of the experimental magnetization data, the mean-field exchange parameter λ and the B S function of the equation of state B S [ ( H + H exch ) / T ] are directly determined, as well as the order of the phase transition. The spin quantum number of the manganite has been also determined. The mean-field scaling has been used to estimate magnetic entropy change ( − Δ S M ) within the thermodynamics of the model and without using the usual numerical integration of a Maxwell relation. The maxima of the positive absolute value of ( − Δ S M ) upon variation of the applied magnetic field at 1 and 5 T are about 1.68 and 5.04 J kg −1 K −1 , respectively. Satisfactory agreement between the mean-field model and experimental behavior has been found. [ABSTRACT FROM AUTHOR]
ISSN:03048853
DOI:10.1016/j.jmmm.2015.05.044