Transport-entropy correlations in La_0.7Ca_0.3MnO₃ manganite

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• 作者：J.C. Debnath ; A.M. Strydom
• 关键词：Perovskite ; Magnetocaloric effect ; Resistivity ; Magnetic polaron
• 刊名：Physica B
• 出版年：1 January, 2014
• 年：2014
• 卷：432
• 期：Complete
• 页码：96-99
• 全文大小：749 K

文摘

An investigation of the magnetic entropy change 螖S_M and resistivity 蟻, and the relation between them, for La_0.7Ca_0.3MnO₃ (LCMO) material has been presented. By using an equation of the form (伪=9.98 emu/g), which relates magnetic order to transport behavior of the compounds, we measure the magnetic entropy change 螖S_M from the resistivity measurement, where the resistivity results agree quite well with the fitting parameter 伪=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 螖S_M, affects the magnetic polarons, while the magnetic polarons influence the electronic transport properties, which may be the underlying reason for a salient 螖S_M鈭?em>蟻 relation. It also provides an alternative method to determine magnetic entropy change on the basis of resistive measurements.