Bondino F, Garg K B, Magnano E, Carleschi E, Heinonen M, Singhal R K, Gaur S K, Parmigiani F
Laboratorio Nazionale TASC INFM-CNR, Basovizza-Trieste, Italy.
J Phys Condens Matter. 2008 Jul 9;20(27):275205. doi: 10.1088/0953-8984/20/27/275205. Epub 2008 Jun 2.
We report an investigation of Mn-doped ZnO pellets with diluted Mn concentration by soft-x-ray emission and absorption spectroscopy. We have compared the electronic structure of two samples with different Mn concentration and different magnetic properties at room temperature: ferromagnetism in one case (Zn(0.98)Mn(0.02)O) and no magnetic order in the other (Zn(0.96)Mn(0.04)O). The results show that most of the Mn ions of the ferromagnetic sample are in the divalent state. For the nonmagnetic sample, a larger contribution of higher oxidation Mn states is present, which can be correlated to the suppressed ferromagnetism. The presence of oxygen atoms bonded to Mn ions and hybridized Mn 3d-O 2p states has been detected in both compounds. The partial density of states in the valence band has been measured with x-ray emission spectroscopy and the Mn 3d states have been found inside the bandgap of ZnO.
我们报告了一项通过软X射线发射和吸收光谱对锰浓度稀释的掺锰氧化锌颗粒进行的研究。我们比较了两个在室温下具有不同锰浓度和不同磁性的样品的电子结构：一个样品表现出铁磁性（Zn(0.98)Mn(0.02)O），另一个则没有磁有序（Zn(0.96)Mn(0.04)O）。结果表明，铁磁样品中的大多数锰离子处于二价态。对于非磁性样品，存在较高氧化态锰的更大贡献，这与铁磁性的抑制相关。在两种化合物中都检测到了与锰离子键合的氧原子以及杂化的锰3d - 氧2p态。利用X射线发射光谱测量了价带中的态密度分布，并且发现锰3d态位于氧化锌的带隙内。
