Ferromagnetic properties of bulkCu1−xMnxOmagnetic semiconductors
Ferromagnetic properties of bulkCu1−xMnxOmagnetic semiconductors
复制标题
DOI：
10.1103/physrevb.75.174444
复制
发表时间：
2007-05
影响因子：
3.7
通讯作者：
K. Gao;Zhi-Qing Li;T. Du;E. Jiang;Y. Li
中科院分区：
文献类型：
--
作者：
K. Gao;Zhi-Qing Li;T. Du;E. Jiang;Y. Li
多晶是在该浓度范围内通过标准固相反应方法制造的。除样品外均观察到铁磁特性。 X射线衍射光谱显示纯CuO相和第二相的出现。 X 射线光电子能谱、晶胞体积和磁性的分析表明，样品中的锰以 的形式掺入到了 CuO 中。在居里温度以上，磁化率可以通过修正的居里-魏斯定律很好地拟合。为了提高磁性，我们另外掺杂了第三种元素铝，并观察到铁磁性的增强。为了研究空穴在铁磁耦合中的作用，还使用溶胶-凝胶方法将锂掺杂到样品中，并观察到铁磁性的抑制（此时铁磁性完全消失）。基于束缚磁极化子的形成，讨论了在 Mn 掺杂 CuO 中观察到的铁磁性。
Polycrystallinehas been fabricated by the standard solid-state reaction method in the concentration range. Ferromagnetic characteristics are observed except for thesamples. X-ray diffraction spectra show a pure CuO phase whenand the appearance of a secondary phasewhen. Analyses of the x-ray photoelectron spectroscopy, the unit cell volume, and magnetism indicate that manganese in the form ofis incorporated into CuO for thesamples. The susceptibility ofcan be well fitted by the modified Curie-Weiss law above the Curie temperature. To improve the magnetism, we additionally doped a third element aluminum inand observed an enhancement of the ferromagnetism. In order to investigate the role of holes in ferromagnetic coupling, lithium was also doped in the sample using the sol-gel method, and a suppression of ferromagnetism was observed (ferromagnetism completely disappears whenin). The observed ferromagnetism in Mn-doped CuO is discussed on the basis of the formation of bound magnetic polarons.