Transport-entropy correlations in La0.7Ca0.3MnO3 manganite

An investigation of the magnetic entropy change ΔSM and resistivity ρ, and the relation between them, for La0.7Ca0.3MnO3 (LCMO) material has been presented. By using an equation of the form ΔSM=−α∫0H[δln(ρ)δT]HdH (α=9.98emu/g), which relates magnetic order to transport behavior of the compounds, we...

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Bibliographic Details
Published inPhysica. B, Condensed matter Vol. 432; pp. 96 - 99
Main Authors Debnath, J.C., Strydom, A.M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.01.2014
Subjects
Condensed matter
Electrical resistivity
Electronics
Entropy
Magnetic polaron
Magnetic properties
Magnetocaloric effect
Manganites
Mathematical analysis
Perovskite
Polarons
Resistivity
Perovskite
Magnetic polaron
Magnetocaloric effect
Resistivity
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Summary:An investigation of the magnetic entropy change ΔSM and resistivity ρ, and the relation between them, for La0.7Ca0.3MnO3 (LCMO) material has been presented. By using an equation of the form ΔSM=−α∫0H[δln(ρ)δT]HdH (α=9.98emu/g), which relates magnetic order to transport behavior of the compounds, we measure the magnetic entropy change ΔSM from the resistivity measurement, where the resistivity results agree quite well with the fitting parameter α=9.98emu/g in the intermediate temperature range. This result reveals the predominant role of magnetic polarons on the magnetoresistive property of manganites. It is obvious that magnetic disorder, characterized by ΔSM, affects the magnetic polarons, while the magnetic polarons influence the electronic transport properties, which may be the underlying reason for a salient ΔSM−ρ relation. It also provides an alternative method to determine magnetic entropy change on the basis of resistive measurements.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2013.09.045