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首页> 外文期刊>Physica, B. Condensed Matter >Competition between the double exchange and charge ordering interactions in the bandwidth controlled (La, Nd)(0.8)Na0.2MnO3 manganites
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Competition between the double exchange and charge ordering interactions in the bandwidth controlled (La, Nd)(0.8)Na0.2MnO3 manganites

机译：带宽控制的（La，Nd）（0.8）Na0.2MnO3锰矿中双交换和电荷有序相互作用之间的竞争

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摘要

Structural, magnetic, and transport properties of (La1-xNdx)(0.8)Na(0.2)MuO(3) (0 less than or equal to x less than or equal to 1) are studied. The system exhibits a rhombohedrally distorted perovskite structure for xless than or equal to0.2 and it converts to an orthorhombic structure for xgreater than or equal to0.4. Re-entrant ferromagnetic-type charge ordering transitions are observed in the narrow bandwidth samples (x greater than or equal to 0.8). For T > 77 K, the compounds show metal to insulator transitions except Nd0.8Na0.2MnO3. The transition temperatures are equal to the corresponding Curie temperatures. Combining our results with the published data on manganites doped with divalent alkali earth cations, we propose that the double exchange interaction in (La1-xNdx)(0.8)Na0.2MnO3 is stronger than that of the divalent cations doped manganites with the same average A-site radius and hole concentrations. The resistivity data above the metal to insulator transition temperature for the charge ordered sample are discussed in the frame work of the variable-range hopping model. (C) 2004 Elsevier B.V. All rights reserved.
机译：研究了（La1-xNdx）（0.8）Na（0.2）MuO（3）（0小于或等于x小于或等于1）的结构，磁性和传输性质。对于小于或等于0.2的x射线，该系统表现出菱形扭曲的钙钛矿结构，对于大于或等于0.4的x射线，其转变为正交晶的结构。在窄带宽样本（x大于或等于0.8）中观察到重入铁磁型电荷有序跃迁。对于T> 77 K，除Nd0.8Na0.2MnO3以外，这些化合物均显示出金属到绝缘体的过渡。转变温度等于相应的居里温度。结合我们的结果和有关掺杂有二价碱土金属阳离子的锰酸盐的公开数据，我们提出（La1-xNdx）（0.8）Na0.2MnO3中的双交换相互作用要强于平均A相同的掺杂二价阳离子的锰酸盐。部位半径和空穴浓度。在可变范围跳变模型的框架中讨论了电荷排序的样品在金属到绝缘体转变温度以上的电阻率数据。 （C）2004 Elsevier B.V.保留所有权利。

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