Possible room-temperature ferromagnetism in SnO2 nanocrystalline powders with nonmagnetic K doping
Possible room-temperature ferromagnetism in SnO2 nanocrystalline powders with nonmagnetic K doping
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非磁性 K 掺杂 SnO2 纳米晶粉末可能具有室温铁磁性
DOI：
10.1016/j.physleta.2011.11.010
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发表时间：
2012-01-02
影响因子：
2.6
通讯作者：
Wu, Ping
中科院分区：
文献类型：
--
作者：
Zhou, Wei;Tang, Xiaomei;Wu, Ping
采用溶胶-凝胶法合成了Sn 1-xKxO 2纳米晶粉末。在室温下，K掺杂样品具有铁磁性，饱和磁化强度随K掺杂浓度的增加而增加。这表明空穴注入诱导铁磁性是可能的。采用第一性原理计算分析了缺陷对结构和磁性能的影响。从结构和价态特征来看，掺杂剂的不均匀分布和晶体中K、H族元素的空穴补偿效应是降低样品磁矩的重要原因。(C)2011 Elsevier B. V.保留所有权利。
Sn1-xKxO2 nanocrystalline powders were synthesized by the sol-gel method. The room-temperature ferromagnetism was observed in K-doped samples, and the saturation magnetization increases with the K concentration. It indicates the ferromagnetism induced by holes injecting is possible. First-principles calculations were employed to analyze the effect of defects on the structural and magnetic properties. Taking into account the structural and valence state characterization, the inhomogeneous distribution of dopants and the holes compensation effect of K and H interstitials in crystal were thought to play important roles in reducing the magnetic moments in samples. (C) 2011 Elsevier B.V. All rights reserved.