Spin-selective Kondo insulator: Cooperation of ferromagnetism and Kondo effect
Abstract
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.
Keywords
Cite
@article{arxiv.1201.3680,
title = {Spin-selective Kondo insulator: Cooperation of ferromagnetism and Kondo effect},
author = {Robert Peters and Norio Kawakami and Thomas Pruschke},
journal= {arXiv preprint arXiv:1201.3680},
year = {2012}
}