Theoretical description of carrier mediated magnetism in cobalt doped ZnO
Theoretical description of carrier mediated magnetism in cobalt doped ZnO
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DOI：
10.1103/physrevlett.100.256401
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发表时间：
2008-06-27
影响因子：
8.6
通讯作者：
Wei, Su-Huai
中科院分区：
文献类型：
--
作者：
Walsh, Aron;Da Silva, Juarez L. F.;Wei, Su-Huai
Substitutional cobalt in ZnO has a weak preference for antiferromagnetic ordering. Stabilization of ferromagnetism is achieved through n-type doping, which can be understood through a band coupling model. However, the description of the transition to a ferromagnetic ground state varies within different levels of band theory; issues arise due to the density functional theory underestimation of the band gap of ZnO, and the relative position of the nominally unfilled Co t(2d) states. We examine these limitations, including approaches to overcome them, and explain the contradictions in previous studies, which drastically overestimate the doping threshold for magnetic ordering.
