Spin-selective Kondo insulator: cooperation of ferromagnetism and the Kondo effect |
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Authors: | Peters Robert Kawakami Norio Pruschke Thomas |
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Affiliation: | Department of Physics, Kyoto University, Kyoto 606-8502, Japan. peters@scphys.kyoto-u.ac.jp |
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Abstract: | 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. |
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