Elfimov I S, Rusydi A, Csiszar S I, Hu Z, Hsieh H H, Lin H-J, Chen C T, Liang R, Sawatzky G A
Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, Canada.
Phys Rev Lett. 2007 Mar 30;98(13):137202. doi: 10.1103/PhysRevLett.98.137202. Epub 2007 Mar 26.
We describe a possible pathway to new magnetic materials with no conventional magnetic elements present. The substitution of nitrogen for oxygen in simple nonmagnetic oxides leads to holes in N 2p states which form local magnetic moments. Because of the very large Hund's rule coupling of Nitrogen and O 2p electrons and the rather extended spatial extent of the wave functions these materials are predicted to be ferromagnetic metals or small band gap insulators. Experimental studies support the theoretical calculations with regard to the basic electronic structure and the formation of local magnetic moments. It remains to be seen if these materials are magnetically ordered and, if so, below what temperature.
我们描述了一条通往不含传统磁性元素的新型磁性材料的可能途径。在简单的非磁性氧化物中用氮取代氧会导致N 2p态出现空穴，这些空穴会形成局域磁矩。由于氮和氧2p电子之间存在非常大的洪德规则耦合，并且波函数的空间范围相当扩展，预计这些材料是铁磁金属或小带隙绝缘体。关于基本电子结构和局域磁矩的形成，实验研究支持了理论计算。这些材料是否呈现磁有序状态，以及如果是，在什么温度以下呈现磁有序状态，仍有待观察。
