Percolation model of La0.67−xYxBa0.23Ca0.1MnO3(0⩽x⩽0.15) composites

[Display omitted] •The samples exhibit PM–FM phase transition.•The electrical transport of LYBCMO composites is investigated.•An agreement between the experimental and calculated magnetic entropy change. The electrical properties of La0.67−xYxBa0.23Ca0.1MnO3(0⩽x⩽0.15) manganite are investigated. For...

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Veröffentlicht in:Chemical physics 2014-06, Vol.436-437, p.40-45
Hauptverfasser: Abassi, Mounira, Dhahri, N., Dhahri, J., Hlil, E.K.
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Sprache:eng
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Zusammenfassung:[Display omitted] •The samples exhibit PM–FM phase transition.•The electrical transport of LYBCMO composites is investigated.•An agreement between the experimental and calculated magnetic entropy change. The electrical properties of La0.67−xYxBa0.23Ca0.1MnO3(0⩽x⩽0.15) manganite are investigated. For the description of ρ(T) at a near phase transition temperature, the representations of the percolation theory are used. This is done on the basis of a phenomenological equation for conductivity under a percolation approach, which depends on the phase segregation of ferromagnetic metallic clusters and paramagnetic insulating regions. By using an equation of the form ΔSMP(T,H)=-α∫0H∂lnρ∂THdH, which relates magnetic order to transport behavior of the compounds, we measure the magnetic entropy change ΔSM from the resistivity measurement. We have found that these magnetic entropy change values are similar to these calculated in our previous work from the magnetic measurements. Finally, we have found an excellent estimation of the magnetic entropy change based on the Landau theory.
ISSN:0301-0104
DOI:10.1016/j.chemphys.2014.03.015