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Structural and ferromagnetic properties of Cu-doped GaN

机译：铜掺杂GaN的结构和铁磁性能

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The wurtzite polymorph of GaN was calcined with CuO in flowing nitrogen. As a result of this processing, both superconducting quantum interference device magnetometry and ferromagnetic resonance studies showed ferromagnetism in these samples at room temperature. These magnetic results are qualitatively consistent with very recent first-principle calculations [Wu et al., Appl. Phys. Lett. 89, 062505 (2006)] that predict ferromagnetism in Cu-doped GaN. We focus in this paper on analyzing changes in the GaN atomic and electronic structure due to calcination with CuO using multiple analytical methods. Quantitative powder x-ray diffraction (XRD) showed changes in the lattice constants of the GaN due to the incorporation of copper (and possibly oxygen). Energy-dispersive x-ray spectroscopy proved the incorporation of copper into the GaN crystal structure. Electron-gun monochromated electron energy loss spectroscopy showed CuO calcinations-induced GaN band gap changes and indicated changes in the atomic arrangements due to the calcination process. The fine structure of the N K-edge showed differences in the peak ratios with respect to higher nominal CuO contents, corresponding to an increase in the c-lattice constant as confirmed by XRD.
机译：在流动的氮气中，用CuO煅烧GaN的纤锌矿多晶型物。作为该处理的结果，超导量子干涉装置的磁力测定法和铁磁共振研究均显示了这些样品在室温下的铁磁性。这些磁性结果与最近的第一性原理计算在质量上是一致的[Wu et al。，Appl。物理来吧89，062505（2006）]预测了掺杂Cu的GaN中的铁磁性。在本文中，我们集中于使用多种分析方法分析由于用CuO煅烧而导致的GaN原子和电子结构的变化。定量粉末X射线衍射（XRD）显示，由于掺入了铜（可能还有氧），GaN的晶格常数发生了变化。能量色散x射线光谱法证明了铜已掺入GaN晶体结构中。电子枪单色电子能量损失谱显示出CuO煅烧引起的GaN带隙变化，并表明了由于煅烧过程导致原子排列的变化。 N K边缘的精细结构相对于较高的标称CuO含量显示出峰比的差异，这对应于X射线衍射证实的c晶格常数增加。

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