Paramagnetism in Cu-doped ZnO

doi:10.1088/1674-1056/19/7/077501

Abstract Zn_0.98Cu_0.02O 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 Zn_0.98Cu_0.02O 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.

Keywords: diluted magnetic semiconductors ZnO paramagnetism defects

Received: 10 November 2009
Revised: 05 January 2010
Accepted manuscript online:

PACS:	75.20.Ck	(Nonmetals)
	61.72.uj	(III-V and II-VI semiconductors)
	81.20.Ev	(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
	81.20.Fw	(Sol-gel processing, precipitation)
	64.75.-g	(Phase equilibria)
	75.50.Pp	(Magnetic semiconductors)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50802041), the National Key Projects for Basic Research of China (Grant No. 2010CB923404), and Southeast University.

Cite this article:

Xu Qing-Yu(徐庆宇), Zheng Xiao-Hong(郑晓红), and Gong You-Pin(龚佑品) Paramagnetism in Cu-doped ZnO 2010 Chin. Phys. B 19 077501

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