An Electron-Attractor Model: FM Nanoclusters Responsible for Magnetoresistant Behavior in Ca-Rich La1-xCaxMnO3

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• 作者：Raquel Corté ; s-Gil ; José ; M. Alonso ; M. Luisa Ruiz-Gonzá ; lez ; Marí ; a Vallet-Regí ; Antonio Hernando ; José ; M. Gonzá ; lez-Calbet
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：May 27, 2008
• 年：2008
• 卷：20
• 期：10
• 页码：3398 - 3403
• 全文大小：1469K
• 年卷期：v.20,no.10(May 27, 2008)
• ISSN：1520-5002

文摘

On the basis of magnetization and resistivity measurements in the La_1-xCa_xMnO₃ system, a model is proposed for explaining the complex magnetic and magnetoresistant behavior along the 0.80 < x < 1 composition range. This model assumes localization of Mn³⁺ cations around La³⁺ substitutional atoms resulting in ferromagnetic nanoclusters, of about 0.9 nm size, due to double exchange interactions with Mn⁴⁺ surrounding being responsible for magnetoresistant behavior. The proposed model allows one to explain the magnetic behavior of both hole and electron doping regions in the La_1-xCa_xMnO₃ system.