Paramagnetism in Cu-doped ZnO |
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| Authors: | Xu Qing-Yu Zheng Xiao-Hong and Gong You-Pin |
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| Affiliation: | Department of Physics, Southeast University, Nanjing 211189, China; Department of Materials Science and Engineering, Nanjing University, Nanjing 210008, China |
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| Abstract: | Zn0.98Cu0.02O powders are prepared by the sol—gel method. A small number of CuO impurity phases are observed by the x-ray diffraction, indicating the solubility of Cu in ZnO is less than 2 at.%. The Zn0.98Cu0.02O powders exhibit diamagnetism at 300 K and paramagnetism at 5 K. After subtracting the diamagnetic contribution of ZnO bulk and the paramagnetic contribution of defects, Cu ions exhibit weak paramagnetism. By codoping Cu with Co or Mn in ZnO, only paramagnetism is observed at room temperature. |
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| Keywords: | diluted magnetic semiconductors ZnO paramagnetism defects |
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