Spin-selective Kondo insulator: Cooperation of ferromagnetism and Kondo effect

Details Spin-selective Kondo insulator: Cooperation of ferromagnetism and Kondo effect Spin-selective Kondo insulator: Cooperation of ferromagnetism and Kondo effect

2012-01-18

arxiv.org/abs/1201.3680v1

Phys. Rev. Lett. 108, 086402 (2012) [5 pages]

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.108.086402

We propose the notion of 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.

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