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

J. C. Debnath; A. M. Strydom

doi:10.1016/j.physb.2013.09.045

Transport-entropy correlations in La_0.7Ca_0.3MnO ₃ manganite

J. C. Debnath, A. M. Strydom

Physics

University of Johannesburg

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

An investigation of the magnetic entropy change ΔS_M and resistivity ρ, and the relation between them, for La_0.7Ca _0.3MnO₃ (LCMO) material has been presented. By using an equation of the form Δ^SM=-α∫ _{0H[δln(ρ)δT]H}dH (α=9.98 emu/g), which relates magnetic order to transport behavior of the compounds, we measure the magnetic entropy change ΔS_M from the resistivity measurement, where the resistivity results agree quite well with the fitting parameter α=9.98 emu/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 ΔS_M, affects the magnetic polarons, while the magnetic polarons influence the electronic transport properties, which may be the underlying reason for a salient ΔS_M-ρ relation. It also provides an alternative method to determine magnetic entropy change on the basis of resistive measurements.

Original language	English
Pages (from-to)	96-99
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	432
DOIs	https://doi.org/10.1016/j.physb.2013.09.045
Publication status	Published - 2014

Keywords

Magnetic polaron
Magnetocaloric effect
Perovskite
Resistivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1016/j.physb.2013.09.045

Cite this

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title = "Transport-entropy correlations in La0.7Ca0.3MnO 3 manganite",

abstract = "An investigation of the magnetic entropy change ΔSM and resistivity ρ, and the relation between them, for La0.7Ca 0.3MnO3 (LCMO) material has been presented. By using an equation of the form ΔSM=-α∫ 0H[δln(ρ)δT]HdH (α=9.98 emu/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=9.98 emu/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.",

keywords = "Magnetic polaron, Magnetocaloric effect, Perovskite, Resistivity",

author = "Debnath, {J. C.} and Strydom, {A. M.}",

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AU - Debnath, J. C.

AU - Strydom, A. M.

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N2 - An investigation of the magnetic entropy change ΔSM and resistivity ρ, and the relation between them, for La0.7Ca 0.3MnO3 (LCMO) material has been presented. By using an equation of the form ΔSM=-α∫ 0H[δln(ρ)δT]HdH (α=9.98 emu/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=9.98 emu/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.

AB - An investigation of the magnetic entropy change ΔSM and resistivity ρ, and the relation between them, for La0.7Ca 0.3MnO3 (LCMO) material has been presented. By using an equation of the form ΔSM=-α∫ 0H[δln(ρ)δT]HdH (α=9.98 emu/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=9.98 emu/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.

KW - Magnetic polaron

KW - Magnetocaloric effect

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