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Magnetism in Zn_(1-x)Mn_xO crystal prepared by hydrothermal method

机译:水热法制备Zn_(1-x)Mn_xO晶体的磁性

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Crystal Zn_(1-x)Mn_xO magnetic semiconductors have been obtained by using a hydrothermal method for the first time at temperature of 703 K with substituent fraction ranging from x=0 to 0.04. X-ray diffraction and optical absorption measurements provide evidence for the locating at Zn site of Mn ion in ZnO crystals. The non-monotonic variation of band gap indicates the short-ranged interactions of sp-d electrons. However, no evidence of ferromagnetism is found in these systems down to T= 2 K. The magnetization is found to be contributed from both free spins and spins associated with antiferromagnetic clusters. The antiferromagnetism is confirmed by fitting a Curie-Weiss function.
机译:晶体Zn_(1-x)Mn_xO磁性半导体是通过水热法在703 K的温度下首次获得的,其取代基分数在x = 0至0.04范围内。 X射线衍射和光吸收测量提供了ZnO晶体中Mn离子位于Zn位置的证据。带隙的非单调变化表明sp-d电子的短程相互作用。但是,在这些系统中直到T = 2 K都没有发现铁磁性的证据。发现磁化是由自由自旋和与反铁磁团簇相关的自旋共同贡献的。通过拟合居里-魏斯函数可以确定反铁磁性。

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