Spin-selective Kondo insulator : Cooperation of ferromagnetism and Kondo effect
Spin-selective Kondo insulator : Cooperation of ferromagnetism and Kondo effect
复制标题
自旋选择性近藤绝缘体：铁磁性和近藤效应的协同作用
DOI：
10.1103/physrevlett.108.086402
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T.Pruschke
中科院分区：
文献类型：
--
作者：
R.Peters;N.Kawakami;T.Pruschke
我们提出了自旋选择性近藤绝缘子的概念，它提供了一个基本的机制来描述具有反铁磁耦合的近藤晶格模型的铁磁相。这揭示了铁磁金属相的一个显著特征：多数自旋传导电子表现出金属性，而少数自旋电子表现出绝缘行为。由于铁磁性和部分近藤筛选的共同作用，在少数自旋扇区产生了近藤间隙，这证明了少数自旋电子和部分局域自旋的组合存在动态诱导的可通约性。此外，该机制预测了电子磁化、自旋极化和电子填充等宏观量之间的非琐碎关系。
We propose the notion of a spin-selective Kondo insulator, which provides a fundamental mechanism to describe the ferromagnetic phase of the Kondo lattice model with antiferromagnetic coupling. This unveils a remarkable feature of the ferromagnetic metallic phase: the majority-spin conduction electrons show metallic while the minority-spin electrons show insulating behavior. The resulting Kondo gap in the minority-spin sector, which is due to the cooperation of ferromagnetism and partial Kondo screening, evidences a dynamically induced commensurability for a combination of minority-spin electrons and parts of localized spins. Furthermore, this mechanism predicts a nontrivial relation between the macroscopic quantities such as electron magnetization, spin polarization, and electron filling.